Air quality is considered satisfactory and air pollution poses little or no risk.
Air quality is acceptable, but for some pollutants there may be a moderate health problem for a very small number of people unusually sensitive to air pollution.
Air quality is not good for members of sensitive groups, while others may be less affected.
PM2.5 (µg/m3)
55.5-150.4
Anyone can start to experience health effects. Members of sensitive groups may experience more serious health effects.
PM2.5 (µg/m3)
150.5-250.4
Air quality is very harmful and significantly affects everyone. Members of sensitive groups are not recommended to go out.
PM2.5 (µg/m3)
PM2.5: 254.7
Air quality is reaching a dangerous level that seriously affects everyone, especially the respiratory and cardiovascular systems. People are advised to close their windows.
