Didcot vs Grays AQI Comparison

Side-by-side OpenAQ-derived air quality comparison for Didcot and Grays. Values use mapped daily PM2.5 and PM10 observations normalized to US EPA AQI.

Lower average AQI: Grays (22-pt gap)PM2.5: Didcot 17.8 ug/m3 · Grays 7.3 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-01-01–2024-12-31 and 2024-01-01–2024-10-25.

Compare two cities

City A

City B

Didcot vs Grays

Didcot

Oxfordshire, United Kingdom

PM2.5: 17.8 ug/m3
PM10: 23.4 ug/m3
Worst month: June
Trend: n/a

EPA category: Moderate

Grays

Thurrock, United Kingdom

PM2.5: 7.3 ug/m3
PM10: 12.5 ug/m3
Worst month: May
Trend: n/a

EPA category: Good

Lower average AQI in this selected period: Grays. Values are historical OpenAQ-derived city summaries, not live readings.

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Didcot

115

Grays

What this comparison measures

Average EPA AQI — city-level daily AQI values averaged across the OpenAQ coverage window.
PM2.5 and PM10 — mapped monitor concentrations aggregated to daily city averages.
Seasonality — worst and cleanest months from the monthly city rollups.
Trend — difference between the earliest and latest yearly AQI average in this build.