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Air pollutant index
Air pollutant index is accordance with monitoring data of Suspended particulate matter (PM10) (excluding diameter over 10 micrometer), and concentration of Sulfur dioxide (SO2), Nitrogen Dioxide (NO2), Carbon monoxide (CO) and Ozone (O3) on that day, contrast the influence of human health to convert the secondary index of pollutants, take the maximum as the PSI on that day. The index value under 100 indicates the air quality of monitoring station conform to USA ambient air quality criteria, short-term average (24 hours or shorter). The value over 100, as USA EPA study, will worsen the symptom and get more allergies of unhealthy people.
(Soruce:Air Quality Web )

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Current status of air quality
According to the 2006 statistics of Taiwan's Pollutant Standards Index (PSI) – PSI>100 indicating air quality – the percentage of days with PSI>100 were 4.2% and 3.7%, respectively (after factoring out the effects of dust storms). The percentage of days with "good air quality" was 41.3%. Before air pollution control fees were levied in 1994, the percentage of days with PSI>100 and with "good air quality" were 7.0% and 34.3%, respectively. The figures clearly indicate that the nation's air quality in recent years has been greatly improved and that efforts to control air pollution have paid off.
(Soruce:EPA, R.O.C )
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