The air pollutants of air quality standards
| Item |
Standard value |
Unit |
| TSP |
24hr |
250 |
μg／m3
|
| In the geometric mean |
130 |
Size equivalent to less than ten microns (μm)
of suspended particles (PM 10 ) |
Day average
24hr avg |
125 |
μg／m3
|
| Year average |
65 |
| SO2 |
24hr avg |
0.25 |
ppm(Volume concentration in parts per million) |
| Day average |
0.1 |
| Year average |
0.03 |
| NO2 |
Hour average |
0.25 |
ppm(Volume concentration in parts per million) |
| Year average |
0.05 |
| CO |
Hour average |
35 |
ppm(Volume concentration in parts per million) |
| 8hr avg |
9 |
| O3 |
Hour average |
0.12 |
ppm(Volume concentration in parts per million) |
| 8hr avg |
0.06 |
| Pb |
Month average |
1.0 |
μg／m3
(Micrograms / cubic meter) |
The present standard of the average of the alleged significance, such as:
- Average hours: one hour refers to the arithmetic mean of the measured value.
- 8hr avg: means eight hours of continuous hours of the average arithmetic mean.
- Dayaverage: one day, means the arithmetic average of an hour on average.
- 24hr avg: Continuous sampling means 24 hours of samples from an analysis of the value of the proceeds.
- Month average: refers to the entire mid-day average of the arithmetic mean.
- Year average: in the year means the arithmetic mean of the average Japanese.
- In the geometric mean: refers to the year in the 24 hours worth of the geometric mean.