Source: State of global air, 202017
Pollutant | Averaging Time | 2005 AQGs | 2021 AQGs |
---|---|---|---|
PM2.5 | Annual | 10 | 5 |
24-hour | 25 | 15 | |
PM10 | Annual | 20 | 15 |
24-hour | 50 | 45 | |
Ozone (O3) | Peak Season | - | 60 |
8-hour | 100 | 100 | |
Nitrogen oxide | Annual | 40 | 10 |
24-hour | - | 25 | |
Sulphur dioxide | 24-hour | 20 | 40 |
Carbon Monoxide | 24-hour | - | 4 |
Source: IQAir (2021), The 2021 World Air Quality Report.30
* New averaging time for 2021 | + Peak season - average of daily maximum 8-hour mean ozone concentration during the six consecutive months with the highest six-month running-average of ozone concentration NO2 1-hour average, SO2 10 minute average, and CO2 8-hour, 1-hour, and 15-minute averages unchanged from previous recommendations. Source: World Health Organization
Source: IQAir (2021), The 2021 World Air Quality Report.30
* New averaging time for 2021 | + Peak season - average of daily maximum 8-hour mean ozone concentration during the six consecutive months with the highest six-month running-average of ozone concentration NO2 1-hour average, SO2 10 minute average, and CO2 8-hour, 1-hour, and 15-minute averages unchanged from previous recommendations. Source: World Health Organization