Derry Seasonal Pollution
Derry usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in July. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Derry and Strabane, United Kingdom.
Search city analytics
Average EPA AQI
40
Rank 50 of 171 cities by average AQI
PM2.5
8.7
ug/m3 annualized city average
Seasonality
November
Cleanest: July
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Derry
53
50
49
40
42
31
26
31
40
31
55
38
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Derry, the current global analytics build covers 340 daily rows from 2024-01-01 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.