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Air Quality Standards

Pollutant Averaging Time Level Unit
Total Suspended Particles (TSP) 24 hours 250  μg/m3
Annual geometric average 130
Size equivalent to less than 10 microns (μm) of suspended particles (PM 10 ) 24 hours 125  μg/m3
Annual average 65
Size equivalent to less than 2.5 microns (μm) of suspended particles (PM 2.5 ) 24 hours 35  μg/m3
Annual average 15
Sulfur dioxide (SO2) 24 hours 0.25  ppm
(Volume concentration in parts per million)
Daily average 0.1
Annual average 0.03
Nitrogen dioxide (NO2) 1-hour 0.25  ppm
(Volume concentration in parts per million)
Annual average 0.05
Carbon monoxide (CO) 1-hour 35  ppm
(Volume concentration in parts per million)
8 hours 9
Ozone (O3) 1-hour 0.12  ppm
(Volume concentration in parts per million)
8 hours 0.06
Lead (Pb) Monthly average 1  μg/m3
(Micrograms / cubic meter)

The present standard of the average of the alleged significance, such as:

  1. 1-hour: one hour refers to the arithmetic mean of the measured value.
  2. 8 hours: means eight hours of continuous hours of the average arithmetic mean.
  3. Daily average: one Daily, means the arithmetic average of an hour on average.
  4. 24 hours: Continuous sampling means 24 hours of samples from an analysis of the value of the proceeds.
  5. Monthly average: refers to the entire mid-Daily average of the arithmetic mean.
  6. Annual average: in the Annual means the arithmetic mean of the daily mean.
  7. Annual geometric average: refers to the Annual in the 24 hours worth of the geometric mean.

last update : 2017/07/31

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