Climate, traffic-related air pollutants and allergic rhinitis prevalence in middle-school children in Taiwan.
The prevalence of allergic rhinitis, a common respiratory disorder, may be rapidly increasing. Epidemiological studies, however, indicate little about its association with climatic factors and air pollution. The relationship between traffic-related air pollutants and allergic rhinitis in middle-school students was therefore investigated. In a nationwide survey of middle-school students in Taiwan conducted in 1995/1996, the lifetime prevalence of physician-diagnosed allergic rhinitis and typical symptoms of allergic rhinitis were compared with air-monitoring station data on temperature, relative humidity, sulphur dioxide (SO2), nitrogen oxides (NOx), ozone (O3), carbon monoxide (CO) and particulate matter with a 50% cut-off aerodynamic diameter of 10 microm (PM10). A total of 331,686 nonsmoking children attended schools located within 2 km of 55 stations. Mean (range) annual exposures were: CO 853 (381-1,610) parts per billion (ppb), NOx 35.1 (10.2-72.4) ppb, SO2 7.57 (0.88-21.2) ppb, PM10 69.2 (40.1-116.2) microg x m(-3), O3 21.3 (12.4-34.1) ppb, temperature 22.9 (19.6-25.1) degrees C, and relative humidity 76.2 (64.8-86.2)%. The prevalence of physician-diagnosed allergic rhinitis was 28.6 and 19.5% in males and females, respectively, with prevalence of questionnaire-determined allergic rhinitis 42.4 and 34.0%. After adjustment for age, parental education and history of atopic eczema, physician-diagnosed allergic rhinitis was found to be associated with higher nonsummer (September-May) warmth and traffic-related air pollutants, including CO, NOx and O3. Questionnaire-determined allergic rhinitis correlated only with traffic-related air pollutants. Nonsummer warmth and traffic-related air pollution, probably mediated through exposure to common allergens such as dust mites, are possible risk factors for allergic rhinitis in middle-school-aged children.
Lee
Y L
YL
Dept of Environmental and Occupational Health, Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan.
Shaw
C K
CK
Su
H J
HJ
Lai
J S
JS
Ko
Y C
YC
Huang
S L
SL
Sung
F C
FC
Guo
Y L
YL
D000293:Adolescent; D000367:Age Factors; D000393:Air Pollutants / Q000009:adverse effects* / Q000032:analysis*; D002648:Child; D002980:Climate; D005260:Female; D019538:Health Care Surveys; D006801:Humans; D008297:Male; D018986:Motor Vehicles; D015995:Prevalence; D012221:Rhinitis, Allergic, Perennial / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology*; D012621:Seasons; D013624:Taiwan / Q000453:epidemiology; D001335:Vehicle Emissions / Q000009:adverse effects* / Q000032:analysis*
D000393:Air Pollutants; D001335:Vehicle Emissions