What is the air quality trend in Colombo?

Over the past 15 days, Colombo had an average AQI of 42 based on station measurements. The worst day was 2026-05-15 with AQI 66.

How is Colombo air quality measured?

Air quality in Colombo is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Colombo, Sri Lanka

Name: Colombo Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Colombo, Sri Lanka.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

334h

PM2.5 Station

334h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-28	43	15–76	11.3 µg/m³	2.2	19h	1
2026-05-27	38	2–91	10.0 µg/m³	8.4	24h	2
2026-05-26	31	15–61	7.5 µg/m³	10.2	24h	1
2026-05-25	29	4–89	7.4 µg/m³	11.9	24h	1
2026-05-24	29	14–44	6.9 µg/m³	13.7	24h	1
2026-05-23	40	11–78	10.7 µg/m³	18.2	24h	1
2026-05-22	44	19–106	11.6 µg/m³	17.9	22h	2
2026-05-21	32	13–67	7.9 µg/m³	13.5	24h	1
2026-05-20	27	11–62	6.6 µg/m³	8.9	24h	1
2026-05-19	30	12–55	7.4 µg/m³	10.9	24h	2
2026-05-18	61	33–132	17.1 µg/m³	5.5	24h	2
2026-05-17	50	25–68	12.9 µg/m³	5.1	24h	2
2026-05-16	62	42–77	17.3 µg/m³	7.4	24h	2
2026-05-15	66	24–144	20.2 µg/m³	9.9	24h	2
2026-05-14	52	47–57	12.8 µg/m³	7.7	5h	2

Back to Colombo Air Quality