細懸浮微粒（PM_(2.5)）自2006年到2016年在台灣的時空趨勢
摘要
Objectives: Air pollution has recently received renewed attention, particularly on the fine particulate matter of 2.5 μm (PM<sub>2.5</sub>) and on sources that generate the pollutant. This study used the air pollution data monitored by the Environmental Protection Administration (EPA) of Executive Yuan to calculate the temporal trends of PM<sub>2.5</sub> monitored from 2006-2016 and to compare levels between industry stations and non-industry stations. Methods: We obtained the EPA data and selected MiaoLi, Changhua, Yunlin and Kaohsiung areas to calculate mean PM<sub>2.5</sub> levels over three 3-year and one 2-year time spans from 2006-2016, and plotted annual mean values for the same period. The temporal trends were compared between industry stations and non-industry stations for each area. Monthly means of all stations in each area in 2016 were also reported to observe the seasonal variations for the 4 areas. Results: The temporal trends of mean PM<sub>2.5</sub> levels declined among all types of monitoring station with the maximum level could be up to 100-fold higher than the minimum level. At an industrial monitoring station of the MiaoLi area, the mean PM<sub>2.5</sub> declined from 29.6 mg/m' in 2006 to 18.2 mg/m' in 2016, which were approximately similar to the corresponding mean levels estimated at two non-industry stations. The mean levels monitored at industrial stations were lower than that at non-industry stations in Changhua and Yunlin areas. Among 12 monitoring stations in the Kaohsiung area, the annual mean PM<sub>2.5</sub> levels were greater at the industrial station than the respective means at 11 non-industrial stations, but declined rapidly to a slightly lower level in 2016. Monthly mean levels in 2016 showed that the PM<sub>2.5</sub> levels were lower in summer months than in spring and winter months in all 4 areas. Conclusions: The PM<sub>2.5</sub> levels were in declining trend in all areas in Taiwan. The effective mitigation of PM<sub>2.5</s