Christchurch Seasonal Pollution
Christchurch usually records its highest OpenAQ-derived EPA AQI in July and its cleanest month in December. The page uses OpenAQ-derived daily history for 4 mapped monitoring locations in Canterbury, New Zealand.
Search city analytics
Average EPA AQI
37
Rank 4 of 7 cities by average AQI
PM2.5
8.2
ug/m3 annualized city average
Seasonality
July
Cleanest: December
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Christchurch
24
27
30
32
59
55
65
51
27
24
26
22
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Christchurch, the current global analytics build covers 360 daily rows from 2024-01-03 to 2024-12-31. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.