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ARTICLES Table of Contents   
Year : 2005  |  Volume : 7  |  Issue : 27  |  Page : 39-47
Noise annoyance in Canada

1 Consumer and Clinical Radiation Protection Bureau, Health Canada, Ottawa, Ontario, Canada
2 Dale McMurchy Consulting, Box 252, Norland, Ontario, Canada

Click here for correspondence address and email

The present paper provides the results from two nation-wide telephone surveys conducted in Canada on a representative sample of 5,232 individuals, 15 years of age and older. The goals of this study were to gauge Canadians' annoyance towards environmental noise, identify the source of noise that is viewed as most annoying and quantify annoyance toward this principal noise source according to internationally accepted specifications. The first survey revealed that nearly 8% of Canadians in this age group were either very or extremely bothered, disturbed or annoyed by noise in general and traffic noise was identified as being the most annoying source. A follow-up survey was conducted to further assess Canadians' annoyance towards traffic noise using both a five-item verbal scale and a ten-point numerical scale. It was shown that 6.7% of respondents indicated they were either very or extremely annoyed by traffic noise on the verbal scale. On the numerical scale, where 10 was equivalent to "extremely annoyed" and 0 was equivalent to "not at all annoyed", 5.0% and 9.1% of respondents rated traffic noise as 8 and above and 7 and above, respectively. The national margin of error for these findings is plus or minus 1.9 percentage points, 19 times out of 20. The results are consistent with an approximate value of 7% for the percentage of Canadians, in the age group studied, highly annoyed by road traffic noise (i.e. about 1.8 million people). We found that age, education level and community size had a statistically significant association with noise annoyance ratings in general and annoyance specifically attributed to traffic noise. The use of the International Organization for Standardization/Technical Specification (ISO/TS)-15666 questions for assessing noise annoyance makes it possible to compare our results to other national surveys that have used the same questions.

Keywords: telephone survey, annoyance, noise, traffic, Canada, ISO/TS-15666

How to cite this article:
Michaud D S, Keith S E, McMurchy D. Noise annoyance in Canada. Noise Health 2005;7:39-47

How to cite this URL:
Michaud D S, Keith S E, McMurchy D. Noise annoyance in Canada. Noise Health [serial online] 2005 [cited 2023 Dec 4];7:39-47. Available from: https://www.noiseandhealth.org/text.asp?2005/7/27/39/31634

  Introduction Top

Noise can be defined as unwanted sound and is commonly associated with annoyance reactions. Environmental noise is ubiquitous and annoyance is one of the most widely studied adverse reactions to noise. According to the World Health Organization (WHO), health should be regarded as "a state of complete physical, mental and social wellbeing and not merely the absence of disease or infirmity" (World Health Organization 2001). Under this broad definition, noise-induced annoyance is an adverse health effect. As with any psychological reaction, annoyance has a wide range of individual variability, which is influenced by multiple personal and situational factors (Fields 1993, Broadbent 1972). On a community scale, however, annoyance is more uniform so that estimating community annoyance is possible through the use of established dose-response curves. The relationship between day-night sound level (Ldn) and the percentage of an exposed population highly annoyed by any transportation noise source was first given by Schultz as a single curve (Schultz 1978) [ 1] . The term "highly annoyed" refers to a response to a social survey question on noise annoyance with a response in the top 27 to 29% on an anchored numerical scale or in the top two categories on an adjectival, five point verbal scale (Schultz 1978). The Schultz curve has been updated (Finegold and Finegold 2002) [2] (Fidell et al. 1991) [3] and separate relationships are also available for aircraft, road traffic and electric rail (Miedema and Oudshoorn 2001) [4] (ISO 2003) [5] . In the ISO standard for assessment procedures for environmental noise the percent highly annoyed is obtained from the rating level (RL) using equation:

% highly annoyed = 100/[1+exp(10.4-0.132*RL)]

where, RL is typically an adjusted Ldn [6] , with adjustments made depending on the type of noise source. In the ISO standard, the relationship for road traffic noise is obtained when RL equals Ldn. The resulting curve nearly coincides with Schultz's original curve.

International estimates of exposure to road traffic noise have been made for Europe, Australia and the U.S. In 1996, it was estimated that, in Europe, 40% of the population was exposed to traffic sound levels between 45­65dBA (Ldn) and 20% (nearly 80 million people) were exposed to levels over 65dBA (Commission of the European Communities 1996). In Australia, approximately 8% of the population was exposed to outdoor road traffic noise levels greater than 65dBA during daytime hours (OECD 1991). In 1986, the Organization for Economic Co-operation and Development (OECD) estimated that 30% of the U.S. population was exposed to a 24 hr time-averaged (Leq24) traffic noise level between 55-65dBA and 7% was exposed to traffic levels above 65 dBA (Leq24) (OECD 1986). Eldred (1990) estimated that 138 million Americans were exposed to outdoor day-night sound levels above 55dBA, with more than 25 million U.S. citizens exposed to levels above 65dBA (Eldred 1990).

International estimates of road traffic noise annoyance from social surveys have also been made for several European countries. Estimations of road traffic noise annoyance from Austria and France (annoyed), Germany (severely affected) and the Netherlands (highly annoyed) range from 20% to 25% of the respective populations (Commission of the European Communities 1996, INRETS 1994). A recent national survey in the United Kingdom (UK) found that between 7-9% of the population was either very or extremely bothered, annoyed or disturbed by traffic noise (Department for Environment, Food and Rural Affairs 2002).

There has been a gap in our knowledge as to how Canada compares to international estimates of annoyance and noise exposure. Only by comparison to Australian data (OECD 1991) has it recently been estimated that about 2 million Canadians live in areas where road traffic noise exceeds Leq24 outdoor levels of 65 dBA (Health Canada 2001).

Comparing results from different surveys on annoyance is difficult because of differences in methodology, which include variability in reporting high annoyance (Finegold and Finegold 2002). As an attempt to circumvent this problem, the ISO/TS-15666 proposed that socio-acoustic surveys incorporate two standardized questions aimed at assessing annoyance (ISO 2001). Our objectives for the present study were to use these standardized questions in order to assess noise annoyance in Canada and characterize the source that was most annoying.

  Methods Top

Subject sampling

The two surveys each entailed a probability sample of approximately 2,600 Canadians 15 years and older, using the Waksberg-Mitofsky technique for random digit phone number selection. Most provinces were allocated a sample size reflecting a 5% margin of error and a 95% confidence interval; the Atlantic Provinces had smaller sample sizes and were grouped together for the purposes of analysis. For each region, the sample was then distributed among community strata according to their relative contributions to the overall provincial population. The five community strata used were as follows: i) less than 5,000; ii) 5,000-9,999; iii) 10,000-29,999; iv) 30,000-99,999; and v) 100,000-999,999. A sixth stratum was added for cities with a population over 1 million residents (Montreal, Toronto and Vancouver). Each respondent indicated the population of their community. Random digit dialing was used to generate potential telephone numbers and one subject within each household was selected using the Troldahl-Carter technique. This technique ensures that the sample accurately represents the eligible population according to its age and sex structures (Troldahl and Carter 1964). Once a potential respondent was chosen using this technique, no other person in the household could be substituted as a respondent. Upon completion of the survey, data were also weighted within provinces by age, sex and community size. Additionally, they were weighted nationally to reflect each province's relative contribution to the overall Canadian population. The national margin of error for this study is plus or minus 1.9 percentage points in 19 samples out of 20.

Telephone Survey #1

In the spring of 2002, PricewaterhouseCoopers Consulting performed a telephone survey for Health Canada wherein a randomized sample of 2,565 Canadians, age 15 and older, responded to a questionnaire on health, their experience with the health care system and health policy. The response rate to this survey was 33%. The questionnaire, that required 20-25 minutes to complete, contained the two following noise­ related questions: Over the past 12 months or so, when you are at home, how much are you bothered, disturbed, or annoyed by noise from outside your home? Subjects were given the following response options: Extremely, Very, Moderately, Slightly or Not at all. The following open-ended question was asked to identify which source Canadians were most annoyed with: What type of noise from outside your home bothers disturbs or annoys you the most?

Telephone Survey #2

A follow-up telephone survey was conducted for Health Canada in December of 2002 by IBM Business Consulting Services™. This survey employed the same methodology as the first survey and the questionnaire was similar in content and length as the first and the response rate was 32%. However, the noise questions in this case specifically probed attitudes towards traffic noise, since this was the source identified as most annoying in the first survey. In accordance with the recommendations provided by ISO/TS-15666 the following two questions were asked to the randomized sample of 2,667 Canadians 15 years of age and older: Thinking about the last 12 months or so, when you are at home, how much does noise from road traffic bother, disturb, or annoy you? Again, subjects were asked to respond with one of the following options: Extremely, Very, Moderately, Slightly or Not at all. An important methodological shortcoming to the verbal scale is that the response categories do not necessarily engender the same meaning between individuals. As a way of checking this possibility the ISO/TS­15666 suggests that a second question with a numerical scale be used to validate the response obtained to the first question. Thus, in this survey the verbal question was followed by the following question: Thinking about the last 12 months or so, what number from zero to ten best shows how much you are bothered, disturbed or annoyed by road traffic noise? Prior to asking this question, the interviewer indicated to the respondent that zero is equivalent to "not at all bothered" and ten is equivalent to "extremely bothered".

  Statistics Top

Univariate and bi-variate (cross-tabulations and t-tests) analyses were employed using statistical data management software, SPSS® version 11.5.

Results reported were statistically significant at the 0.05 level. Where multiple variables were significant and deemed relevant, logistic regression was employed to identify those factors most predictive of the various outcomes.

  Results Top

[Table - 1] shows that about 8% of the sample indicated that they were either very or extremely bothered, disturbed or annoyed by noise outside their home, whereas nearly half of the respondents (49%) were not at all bothered. The major findings presented in [Table - 1] indicate that there was a statistically significant relationship between age, community size, education and sex with the level of annoyance. People 65 and over were the least likely to be annoyed by noise and the larger the respondent's community size, the more likely he or she was to be very or extremely disturbed by noise. Females were more likely to respond that they were slightly to extremely annoyed by noise compared to males. Finally, respondents with greater than secondary education were the least likely to respond that they were slightly or not at all annoyed by noise compared to those with a secondary or less then secondary education.

[Table - 2] shows the breakdown of the sources that respondents identified as being most annoying.

It is apparent that traffic noise is the most significant source of noise annoyance in Canada.

Results from the December survey were intended to further probe Canadians' annoyance towards traffic noise. The major findings were that, while nearly 7% of the respondents indicated that they were either very or extremely bothered by traffic noise, almost 63% were not at all bothered. [Figure - 1], panel A, shows the distribution of annoyance towards traffic noise. In this survey, respondents also had the opportunity to indicate how annoyed they were with traffic noise on a ten-point numerical scale, where zero represented "not at all annoyed" and ten represented "extremely annoyed". These results are presented in [Figure - 1], panel B. Panel

C, in [Figure - 1] presents the results from the numerical scale collapsed according to the following breakpoints (0+1=not at all; 2+3=slightly; 4+5+6=moderately; 7+8=very and 9+10=extremely). Collapsing the numerical scale in this way yielded a correlation coefficient of 0.765 (p<0.001) between panel A and panel C.

[Table - 3] shows how annoyance ratings varied as a function of community size. Not surprisingly, annoyance towards traffic noise increased as function of community size so that almost 78% of the respondents from communities with less than 5,000 people were not at all annoyed by traffic noise, compared to only 58% of the respondents in communities with more than 100,000 residents. In communities with more than 100,000 people, approximately 20% of respondents were moderately to extremely annoyed by traffic noise, compared to only 11% in communities with less than 5,000 residents.

Females were not only more annoyed by noise than males in general, but were 1.5 times more likely to be annoyed by traffic noise in particular. The average response from females on the numerical scale was 2.37 compared to 1.93 for males. Age and income had a statistically significant influence on respondent's annoyance ratings towards traffic noise. Individuals 65 and over were more likely to respond "not at all" annoyed and individuals between 25 and 44, were least likely to respond this way. Those in the middle-income bracket ($20,000-$49,999) were significantly more likely to be annoyed by traffic noise than respondents with incomes below and above this level. While almost three ­quarters of those with less than a secondary education were not at all bothered by traffic noise compared to 60% of those with a post­secondary education, no significant difference was found among education levels when those responding "slightly" and "not at all" were considered together. Another interesting observation was that individuals who rated their health as only fair or poor had a significantly higher mean rating on the numerical scale compared to those who said their health was good or excellent indicating that for traffic noise they had a greater level of annoyance (2.47 versus 2.09, respectively).

  Discussion Top

There is no doubt that transportation noise can represent a significant source of annoyance. Efforts to reduce annoyance towards environmental noise should be greatly improved by an understanding of the pervasiveness of the annoyance. To our knowledge, the present study represents the first attempt to estimate noise annoyance in Canada using a national survey. Statistics Canada estimates that the Canadian population 15 years of age and over in 2003 was approximately 26 million (Statistics Canada 2004). Thus, our results suggest that nearly 2.1 million Canadians 15 years of age and over (+/­approximately 400,000) are either very or extremely annoyed by noise in general, and that 1.8 million Canadians 15 years of age and over (+/- 350,000) are similarly annoyed by traffic noise. It follows that the greatest reduction, nationally, in annoyance can be expected from efforts aimed towards reducing traffic noise in Canada. Our results are comparable to that obtained in the national survey conducted in the UK where it was found that 8% of the population was either very or extremely annoyed by traffic noise (BRE Environment 2002). This is an interesting comparison because the population of the UK in mid-2000 was about double that of Canada (Office for National Statistics 2003).

Our results indicate that traffic noise annoyance was greater among women and individuals with a higher income, and is lower among those 65 and over. In this study, education was no longer statistically associated with the level of traffic noise annoyance when the categories "slightly" and "not at all" were collapsed. However, these results were not entirely consistent with those of Fields (1993) in his review of the personal and situational factors contributing to noise annoyance. He found that education, income and age had no influence on annoyance ratings (Fields 1993). Our results are similar to a community study conducted in Canada 25 years ago that showed annoyance towards traffic noise was greater among residents classified as having a higher socioeconomic status (Bradley 1979). A higher socioeconomic status may be correlated with annoyance inasmuch as higher social status may be associated with a greater expectation of quiet, but this remains to be confirmed.

A recent study by (Ohrstrom 2004) showed the effectiveness of reducing annoyance by reducing traffic volume in a community in Sweden. In her longitudinal study, 58% of the exposed community was very annoyed by traffic noise caused by 25,000-30,000 vehicles per day (Leq­24hr = 67 dBA) and the average numerical rating on the 10-point annoyance scale was 8.9 9 . When traffic volume was reduced to 2,400 vehicles per day (Leq-24hr = 55dBA) the percentage highly annoyed dropped to 6.7% and the average numerical rating fell to 1.4. Not surprisingly, the reduction in traffic noise annoyance corresponded to an overall improvement in self ­assessed general well-being. It is notable that it has been estimated that about 2 million Canadians are exposed to traffic noise levels in the range reported in Ohrstrom's study, before traffic volume was reduced (i.e. Leq24 > 65dBA). Based on the ISO curve (ISO 2003) though, it would not be expected that as many as 58% of these 2 million Canadians are very or extremely annoyed with traffic noise; non­acoustic variables likely contributed to annoyance in Ohrstrom's study sample (2001).

Our findings provide a basis for establishing a full-scale national socio-acoustic survey similar to the UK study (BRE Environment 2002). This could further identify Canadian's concerns towards noise and, in turn, help devise strategies targeted at reducing annoyance. For instance, it was revealed in the UK survey that what specifically annoyed people the most about traffic was accelerating or speeding vehicles (BRE Environment 2002). In our initial survey we attempted to identify the sources which annoyed people the most, but among the 7.9% of respondents that were either very or extremely annoyed by noise in general, nearly 25% of them identified a type of source that was not one of the 18 sources listed in [Table - 2]. More research could also help identify these unknown sources and target them to reduce annoyance among those highly annoyed.

Since acoustic variables may account for one third of the variance in annoyance, (Guski 1999) the present study would be improved if estimating respondent's noise exposure were possible. Future questions could specifically ask subjects how close they are to traffic and how often they are exposed. This would enable an estimate of the extent to which the noise levels correlate with annoyance scores.

The first survey was initiated as a pilot study to gauge Canadian's annoyance toward noise in general. It is of interest that among the 1257 respondents that indicated they were not at all annoyed by noise, 225 of them identified traffic as one of the sources that bothers, disturbs or annoys them the most. At first this finding seems paradoxical. It should be noted, however, that although everyone was asked both questions, most respondents that were not at all annoyed by noise in general did not provide a source that annoyed them the most. Thus, it is possible that one identifies traffic as the most annoying source of noise after indicating they are not at all annoyed by noise because 1) they have an expectation of the noise source that people would indicate as most annoying and they conform to this or 2) they find traffic so annoying that they effectively eliminate annoyance by avoiding the source that is most annoying.

Some caution should be made in comparing the results we obtained in the December survey to those conducted during warmer months since indoor noise exposure levels may be reduced in December with closed windows and people are more likely to be indoors during colder months. Although respondents are specifically instructed to respond based on their experience over the last 12 months or so, this may not fully account for seasonal effects. Seasonal effects on noise annoyance have been shown to account for as much as 10% of the variability in annoyance (Fields et al. 2000). Still, our results remain comparable to those obtained in the UK study since it was conducted in December/January.

For both surveys, the response rate was around 33%. Although this is common for public opinion research that utilizes random digit dialing (O'Rourke et al. 1998), we cannot rule out the possibility that selection bias may have had an impact on our results. It is important to note, though that a respondent's decision to participate or refuse to participate in the telephone survey was made without any knowledge that the survey would contain questions related to environmental noise. Furthermore, follow-up calls were made to individuals with soft refusals and numbers with no initial response.

The results of this study provide a basis for a more elaborate socio-acoustic survey that contains questions designed to estimate the respondent's level of noise exposure to transportation noise and to understand what non­auditory factors contribute to environmental noise annoyance. An ideal study would be supplemented with environmental noise mapping to better calculate how noise levels correlate with annoyance[24].

  References Top

1.Bradley J.S. (1979) The effects of site selected variables on human responses to traffic noise, Part 2: Road type by socio-economic status by traffic noise level. J. Sound Fib., 67: 395-407  Back to cited text no. 1    
2.Broadbent D.E. (1972) Individual differences in annoyance by noise. Sound, 6: 56-61  Back to cited text no. 2    
3.Commission of the European Communities (Brussels) (1996) Green Paper on Future Noise Policy.  Back to cited text no. 3    
4.Department for Environment, Food and Rural Affairs (2002) The 1999/2000 national survey of attitudes to environmental noise-Volume 3 United Kingdom results. 205217f  Back to cited text no. 4    
5.Eldred K.M. (1990) Noise at the year 2000. In: Proceedings of the 5th International Congress on Noise as a Public Health Problem: New Advances in Noise Research Part II, Berglund, B and Lindvall, T (eds) 5: 355­381  Back to cited text no. 5    
6.Fidell S., Barber D.S. and Schultz T. (1991) Updating a dosage-effect relationship for the prevalence of annoyance due to general transportation noise. J. Acoust. Soc. Am., 89: 221-233  Back to cited text no. 6    
7.Fields J.M. (1993) Effect of personal and situational variables on noise annoyance in residential areas. J. Acoust. Soc. Am., 93: 2753-2763  Back to cited text no. 7    
8.Fields, J.M., Ehrlich, G.E. and Zador, P. (2000) Theory and design tools for studies of reactions to abrupt changes in noise exposure. NASA/CR-2000-210280, Langley Research Center, Hampton, Va.: NASA  Back to cited text no. 8    
9.Finegold L.S. and Finegold M.S. (2002) Development of exposure-response relationships between transportation noise and community annoyance. J. Aviation. Environ. Res., 7: 11-22  Back to cited text no. 9    
10.Guski R. (1999) Personal and social variables as co­determinants of noise annoyance. Noise Health, 1: 45-56  Back to cited text no. 10    
11.Health Canada (Ottawa) (2001) Noise from civilian aircraft in the vicinity of airports-Implications for human health 1. Noise, stress and cardiovascular disease.  Back to cited text no. 11    
12.INRETS (Cedex, France) (1994) Study related to the preparation of a communication on a future EC noise policy. 9420  Back to cited text no. 12    
13.International Organization for Standardization (2001) Technical Specification ISO/TS 15666 "Acoustics­Assessment of noise annoyance by means of social and socio-acoustic surveys".  Back to cited text no. 13    
14.International Organization for Standardization (2003) Acoustics-Description, measurement and assessment of environmental noise-Part 1: Basic quantities and assessment procedures. ISO 1996-1:2003(E)  Back to cited text no. 14    
15.Miedema H.M. and Oudshoorn C.G. (2001) Annoyance from transportation noise: relationships with exposure metrics DNL and DENL and their confidence intervals. Environ. Health Perspect., 109: 409-416  Back to cited text no. 15    
16.Office for National Statistics (2003) Population Estimates. Office for National Statistics, http://www.statistics.gov.uk/cci/nugget.asp?id=6 (accessed 09/03/2004)  Back to cited text no. 16    
17.Ohrstrom E. (2004) Longitudinal surveys on effects of changes in road traffic noise--anoyance, activity disturbances, and psycho-social well-being. J. Acoust. Soc. Am., 115: 719-729  Back to cited text no. 17    
18.Organisation for Economic Co-operation and development (Paris) (1986) Fighting Noise: Strengthening noise abatement policies.  Back to cited text no. 18    
19.Organisation for Economic Co-operation and Development (Paris) (1991) Fighting noise in the 90s.  Back to cited text no. 19    
20.O'Rourke D., Chapa-Resendez G., Hamilton L., Lind K., Owens L. and Parker V. (1998) An Inquiry into declining RDD response rates. Part 1: Telephone survey practices. Surv. Res., 29: 1-14  Back to cited text no. 20    
21.Schultz T. (1978) Synthesis of social surveys on noise annoyance. J Acoust. Soc Am., 64: 377-405  Back to cited text no. 21    
22.Statistics Canada (2004) Estimates of population, by age group and sex, Canada, provinces and territories, annual (Persons unless otherwise noted) (4725 series). Statistics Canada  Back to cited text no. 22    
23.Troldahl V.C. and Carter R.E. (1964) Random selection of respondents with households in phone surveys. J. Marketing Surveys, 1: 71-76  Back to cited text no. 23    
24.World Health Organization (2001) Occupational and Community Noise. WHO-OMS, http://www.who.int.inf­fs/en/fact258.html (accessed on 10/01/2004)  Back to cited text no. 24    

Correspondence Address:
D S Michaud
Healthy Environments and Consumer Safety Branch, Product Safety Programme, Consumer and Clinical Radiation Protection Bureau, Acoustics Division, 775 Brookfield Road, Address Locator 6301B, Ottawa, Ontario, K1A 1C1
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1463-1741.31634

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  [Figure - 1]

  [Table - 1], [Table - 2], [Table - 3]

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Murphy, E., King, E.A., Rice, H.J.
Environment International. 2009; 35(2): 298-302
29 Environmental noise and annoyance in adult population of skopje: A crosssectional study
Ristovska, G., Gjorgjev, D., Polozhani, A., Kocubovski, M., Kendrovski, V.
Arhiv za Higijenu Rada i Toksikologiju. 2009; 60(3): 349-355
30 Annoyance due to aircraft noise has increased over the years-Results of the HYENA study
Babisch, W., Houthuijs, D., Pershagen, G., Cadum, E., Katsouyanni, K., Velonakis, M., Dudley, M.-L., (...), Järup, L.
Environment International. 2009; 35(8): 1169-1176
31 The Impact of Companion Animal Problems on Society and the Role of Veterinarians
Voith, V.L.
Veterinary Clinics of North America - Small Animal Practice. 2009; 39(2): 327-345
32 The Impact of Companion Animal Problems on Society and the Role of Veterinarians
Victoria L. Voith
Veterinary Clinics of North America: Small Animal Practice. 2009; 39(2): 327
[Pubmed] | [DOI]
33 Annoyance from environmental noise across the lifespan
Pascal W. M. Van Gerven, Henk Vos, Martin P. J. Van Boxtel, Sabine A. Janssen, Henk M. E. Miedema
The Journal of the Acoustical Society of America. 2009; 126(1): 187-194
[Pubmed] | [DOI]
34 Environmental Noise and Annoyance in Adult Population of Skopje: A Cross-Sectional Study
Gordana Ristovska,Dragan Gjorgjev,Aziz Polozhani,Mihail Kocubovski,Vladimir Kendrovski
Archives of Industrial Hygiene and Toxicology. 2009; 60(3)
[Pubmed] | [DOI]
35 Estimating human exposure to transport noise in central Dublin, Ireland
E. Murphy,E.A. King,H.J. Rice
Environment International. 2009; 35(2): 298
[Pubmed] | [DOI]
36 Annoyance and disturbance of daily activities from road traffic noise in Canada
David S. Michaud, Stephen E. Keith, Dale McMurchy
The Journal of the Acoustical Society of America. 2008; 123(2): 784-792
[Pubmed] | [DOI]
37 Using a change in percent highly annoyed with noise as a potential health effect measure for projects under the Canadian Environmental Assessment Act
Michaud, D.S., Bly, S.H.P., Keith, S.E.
Canadian Acoustics - Acoustique Canadienne. 2008; 36(2): 13-28
38 Investigation of road-traffic noise and annoyance in beijing: A cross-sectional study of 4th ring road
Li, H.-J., Yu, W.-B., Lu, J.-Q., Zeng, L., Li, N., Zhao, Y.-M.
Archives of Environmental and Occupational Health. 2008; 63(1): 27-33