Ad Dir‘īyah Seasonal Pollution
Ad Dir‘īyah usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in October. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Ar Riyāḑ, Saudi Arabia.
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Average EPA AQI
77
Rank 2 of 3 cities by average AQI
PM2.5
23.7
ug/m3 annualized city average
Seasonality
November
Cleanest: October
Health indicator
1.1
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Ad Dir‘īyah
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67
78
77
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Ad Dir‘īyah, the current global analytics build covers 67 daily rows from 2024-10-26 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.