Colombo
Western Province, Sri Lanka
- PM2.5
- 17.4 ug/m3
- PM10
- n/a ug/m3
- Worst month
- March
- Trend
- n/a
EPA category: Moderate
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 (2-pt gap)PM2.5: Colombo 17.4 ug/m3 · Jaffna 17.5 ug/m3
Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-01-01–2024-12-31 and 2024-04-24–2024-12-31.
Compare two cities
vs
Colombo vs Jaffna
64
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
91
97
99
63
54
50
42
40
44
42
63
88
Jaffna
-
-
-
64
57
56
58
58
58
57
82
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.