| Air Quality Guidelines, WHO, 1999 (Table) |
| Compound |
Guideline |
Exposure |
|
Carbon monoxide
|
100mg/m3 (90 ppm)
|
15 min
|
|
60mg/m3 (50 ppm)
|
30 min
|
|
30mg/m3 (25 ppm)
|
1 hr
|
|
10mg/m3 (10 ppm)
|
8 hrs
|
|
Lead
|
0.5 to 1 mg/m3
|
annual
|
|
Nitrogen dioxide
|
200µg/m3 (.11 ppm)
40-50µg/m3 (.021-.026 ppm)
|
1 hr
annual
|
|
Ozone
|
120µg/m3 (.06 ppm)
|
8 hrs
|
|
PM10
|
no evident threshold
US: 50µg/m3 (25 ppm)
EU: 20-40µg/m3 (10 ppm)
|
annual
|
|
Sulfur dioxide
|
500µg/m3 (.175 ppm)
125µg/m3 (.044 ppm)
|
24 hrs
|
|
|
|
| |
