Developing a risk-based air quality health index

污染物 空气质量指数 环境卫生 空气污染 二氧化氮 环境科学 空气污染物 微粒 索引(排版) 公共卫生 臭氧 医学 气象学 地理 计算机科学 生物 万维网 护理部 有机化学 化学 生态学
作者
Tze Wai Wong,Wilson Tam,Ignatius Tak Sun Yu,Alexis K.H. Lau,Sik Wing Pang,Andromeda H.S. Wong
出处
期刊:Atmospheric Environment [Elsevier BV]
卷期号:76: 52-58 被引量:110
标识
DOI:10.1016/j.atmosenv.2012.06.071
摘要

We developed a risk-based, multi-pollutant air quality health index (AQHI) reporting system in Hong Kong, based on the Canadian approach. We performed time series studies to obtain the relative risks of hospital admissions for respiratory and cardiovascular diseases associated with four air pollutants: sulphur dioxide, nitrogen dioxide, ozone, and particulate matter with an aerodynamic diameter less than 10 μm (PM10). We then calculated the sum of excess risks of the hospital admissions associated with these air pollutants. The cut-off points of the summed excess risk, for the issuance of different health warnings, were based on the concentrations of these pollutants recommended as short-term Air Quality Guidelines by the World Health Organization. The excess risks were adjusted downwards for young children and the elderly. Health risk was grouped into five categories and sub-divided into eleven bands, with equal increments in excess risk from band 1 up to band 10 (the 11th band is ‘band 10+’). We developed health warning messages for the general public, including at-risk groups: young children, the elderly, and people with pre-existing cardiac or respiratory diseases. The new system addressed two major shortcomings of the current standard-based system; namely, the time lag between a sudden rise in air pollutant concentrations and the issue of a health warning, and the reliance on one dominant pollutant to calculate the index. Hence, the AQHI represents an improvement over Hong Kong's existing air pollution index.
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