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(Art. 2 para. 5)
| Pollutant | Ambient air limit value | Statistical definition |
|---|---|---|
| Sulphur dioxide (SO | 30 µg/m3 | Annual average (arithmetic mean) |
| 100 µg/m3 | 95 % of half-hour means for one year ≤ 100 µg/m3 | |
| 100 µg/m3 | 24-hour mean; must not be exceeded more than once per year | |
| Nitrogen dioxide (NO | 30 µg/m3 | Annual average (arithmetic mean) |
| 100 µg/m3 | 95 % of half-hour means for one year ≤ 100 µg/m3 | |
| 80 µg/m3 | 24-hour mean; must not be exceeded more than once per year | |
| Carbon monoxide (CO) | 8 mg/m3 | 24-hour mean; must not be exceeded more than once per year |
| Ozone (O | 100 µg/m3 | 98 % of half-hour means for one month ≤ 100 µg/m3 |
| 120 µg/m3 | 1-hour mean; must not be exceeded more than once per year | |
| Suspended particulates (PM10)1 | 20 µg/ma | Annual average (arithmetic mean) |
| 50 µg/m3 | 24-hour mean; must not be exceeded more than once per year | |
| Suspended particulatesb (PM2.5)b | 10 µg/m3 | Annual average (arithmetic mean) |
| Lead (Pb) in PM10 | 500 ng /m3 | Annual average (arithmetic mean) |
| Cadmium (Cd) in PM10 | 1.5 ng/m3 | Annual average (arithmetic mean) |
| Total dust deposition | 200 mg/m2× day | Annual average (arithmetic mean) |
| Lead (Pb) in dust fallout | 100 µg/m2× day | Annual average (arithmetic mean) |
| Cadmium (Cd) in dust fallout | 2 µg/m2× day | Annual average (arithmetic mean) |
| Zinc (Zn) in dust fallout | 400 µg/m2× day | Annual average (arithmetic mean) |
| Thallium (Tl) in dust fallout | 2 µg/m2× day | Annual average (arithmetic mean) |
| Notes: mg = milligram: 1 mg = 0.001 g µg = microgram: 1 µg = 0.001 mg ng = nanogram: 1 ng = 0.001 µg d = day The sign ≤ means «less than or equal to». |
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