The Short-Term Effect of Ozone on Peak Expiratory Flow Rate of Children in Primary School
| Autor: | Yen-chun Chang, 張彥駿 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 Many epidemiological studies have reported ozone and particulate matter are responsible for increased respiratory symptoms and diseases in schoolchildren. But the effects of fine particle (PM2.5) and ultra-fine particle (PM1) are still unclear. Therefore, this study assessed the contributions of particulate matter (PM1/PM2.5/PM10), and ozone concentrations to peak expiratory flow rate (PEFR) in 52 schoolchildren for 22 days during two periods in 2000 and 2001. We measured peak flow in the morning on children’s arrival at school and in the evening before departing from school. The Air pollutant concentrations were obtained from the Taiwan EPA fixed-site air monitoring station located on campus and the trichotomous sampler. Mean daytime (8am-4pm) ozone concentration was 29.3 ppb (maximum=75.3 ppb), and mean daytime particulate level was 58.6 μg/m3 (maximum 162.4 μg/m3) for PM10, 33.9 μg/m3 (maximum 68.93 μg/m3) for PM2.5, and 18.2 μg/m3 (maximum 38.7 μg/m3) for PM1. We found a significant negative association between morning PEFR and pre-day mean daytime ozone concentrations (b coefficient= -0.12; p=0.04), and afternoon PEFR and same-day (b coefficient= -0.28; p=0.01) and pre-day mean daytime ozone concentrations (b coefficient= -0.36; p=0.02), after adjusted gender, height, temperature, relative humidity, daily symptoms, history diseases, household smoking, pets, incense burning, season, and co-pollutants. But we were not able to demonstrate any association between daily PEFR and mean daytime PM2.5/PM10 and mean daily PM1. The study location is located in the center of Taipei city, and the main sources of air pollution were from traffic. The ozone levels of this fixed-site air monitoring station were low comparing other sites in Taipei and Taiwan during the study periods. Despite the concentration of daytime ambient ozone were not high, we found significant negative associations between PEFR and mean daytime ozone concentration. Therefore, we suggest that current levels of ambient ozone in Taipei may have an adverse health effect on lung function of schoolchildren. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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