Table 1 Breakpoints (µg/m3 for all pollutants and mg/m3 for CO) for the proposed API (Murena 2004)
Pollution level | API | PM10 | NO2 | CO | SO2 | O3 |
|---|---|---|---|---|---|---|
Unhealthy | 85–100 | 238–500 | 950–1900 | 15.5–30 | 500–1000 | 223–500 |
Unhealthy for sensitive groups | 70–85 | 144–238 | 400–950 | 11.6–15.5 | 250–500 | 180–223 |
Moderate pollution | 50–70 | 50–144 | 200–400 | 10–11.6 | 125–250 | 120–180 |
Low pollution | 25–50 | 20–50 | 40–200 | 4–10 | 20–125 | 65–120 |
Good quality | 0–25 | 0–20 | 0–40 | 0–4 | 0–20 | 0–65 |