Amendments to Air Quality Standards Preannounced


To further improve the air quality in Taiwan, the EPA has revised the Air Quality Standards according to the current air quality conditions and international trends. The daily average PM10 limit value will be brought down from 125g/m3 to 100g/m3.

It has been five years since the air quality standards were last amended on 14 May 2012. In the last revisions, standards for both the annual and 24-hour PM2.5 concentrations were added. Hence, the determination methods for the compliance of the standards that apply to air quality control zones and total emission control zones were also revised in accordance with the changes. 

To gradually reduce smog and particulate matter pollution that have been raising public concerns, the EPA plans to tighten the air quality standards based on the WHO Air Quality Guidelines to serve as the basis of future reduction timetable and goals. The new standards will lower the daily average PM10 limit value from 125g/m3 to 100g/m3 and reduce the annual average limit from 65g/m3 to 50g/m3. 

To keep in line with international trends, the EPA will lower the maximum one-hour average SO2 concentration from 0.25ppm to 0.075ppm and also the maximum one-hour average NO2 concentration from 0.25 ppm to 0.1 ppm. Furthermore, the air quality standard for lead will be set at 0.15g/m3 as a rolling three-month average concentration. The new standard aligns with the current US air quality standard for lead, which is currently considered the strictest in the world. 

The new revisions to the air quality standards were formulated after taking into account of the current progress on air quality improvement and international research and studies on public health. By evaluating the differences in air quality standards between Taiwan and other countries, the tightened standards were designed to strengthen the implementation of air pollution reduction policies. 

Excerpt from Environmental Policy Monthly, 22 (6)

Environmental Protection Administration, R.O.C.(Taiwan)
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