From 1994 to 2002, the populations and vehicles increase graguatly in Tainan County. The factories was decreasing since 1997 ,and increasing from 2002. The poor air quality ( the PSI value over 100 ) ratio dropped from the 1994 level of 3.8% to 2.1% in 2003 in Tainan County. The united investigation on the biggest 50 factories make the data revised correctly. The ozone episode TAQM modeling result showed the high ozone area is in central and east part of Tainan County. In the case of the concentrated open burning of rice paddy, the PM10 increment rate is over 10 % in Tainan County. Taking out the emission of Tainan, the ozone concentration will be reduced siginificantly in central and south part of Tainan County and Kaohsiung County. The emission of No.6 Naphtha Cracking Project will cause ozone concentration increased on the west shore of Tainan and the sea beside Kaohsiung. The goal of air quality is PSI>100 ratio : 2004-2.8%。. The goal of emission reduction was planed ,2004-TSP-3304 Ton/yr,SOx-70 Ton/yr,NOx-35 Ton/yr,、VOCs-156 Ton/yr. We set the goal of air pollution petition cases on nuisance per thousand people 2004-1.5 , and the goal of the efficiency on soluting petition cases on nuisance 2004-0.6day . The control strategies was planned. We planned and announced the Tainan County Air Pollution Control Plan. We audited the projects supported by the air pollution fee. We worked on the management of air-purification . We audited the street dust cleaning project. The 10 TSP inspections before and after street dust cleaning works show that TSP could be improved by street dust cleaning works.

Air quality,emission,control strategies,audit