Colombo vs Jaffna AQI Comparison

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

Lower average AQI: Colombo (11-pt gap)PM2.5: Colombo 13.6 ug/m3 · Jaffna 17.5 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-03-19–2024-12-28 and 2024-04-24–2024-12-31.

Compare two cities

City A

City B

Colombo vs Jaffna

Colombo

Western, Sri Lanka

PM2.5: 13.6 ug/m3
PM10: n/a ug/m3
Worst month: March
Trend: n/a

EPA category: Moderate

Jaffna

North Central, Sri Lanka

PM2.5: 17.5 ug/m3
PM10: n/a ug/m3
Worst month: December
Trend: n/a

EPA category: Moderate

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Colombo

Jaffna

100

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.