Christchurch in the smog
John's Weather-Watcher
Christchurch, New Zealand

Smog Check




(Air Quality Data provided by Environment Canterbury)



Air Quality Index

(See health implications table below)


Definitions (click to view)

PM2.5  and  PM10
Nitrogen Dioxide (NO2)
Sulphur Dioxide (SO2)
Carbon Monoxide (CO)


AQIAir Pollution LevelHealth ImplicationsCautionary Statement (for PM2.5)
0 - 50 Good Air quality is considered satisfactory, and air pollution poses little or no risk. None
51 - 100 Moderate Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution. Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
101 - 150 Unhealthy for Sensitive Groups Members of sensitive groups may experience health effects. The general public is not likely to be affected. Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
151 - 200 Unhealthy Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects. Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion
201 - 300 Very Unhealthy Health warnings of emergency conditions. The entire population is more likely to be affected. Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion.
301 + Hazardous Health alert: everyone may experience more serious health effects. Everyone should avoid all outdoor exertion.