Grójec Seasonal Pollution
Grójec usually records its highest OpenAQ-derived EPA AQI in December and its cleanest month in July. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Mazowieckie, Poland.
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Average EPA AQI
41
Rank 92 of 155 cities by average AQI
PM2.5
29.0
ug/m3 annualized city average
Seasonality
December
Cleanest: July
Health indicator
1.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Grójec
18
16
25
16
16
15
13
16
74
81
98
100
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Grójec, the current global analytics build covers 361 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.