What is the air quality trend in Chilaw?

Over the past 7 days, Chilaw had an average AQI of 43 based on station measurements. The worst day was 2026-05-27 with AQI 58.

How is Chilaw air quality measured?

Air quality in Chilaw 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 Chilaw, Sri Lanka

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

158h

PM2.5 Station

158h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-28	38	22–59	9.3 µg/m³	19.6	21h	1
2026-05-27	58	26–162	19.0 µg/m³	36.0	24h	1
2026-05-26	41	18–97	10.9 µg/m³	20.9	24h	1
2026-05-25	49	25–163	14.3 µg/m³	27.7	24h	1
2026-05-24	41	30–58	9.9 µg/m³	20.3	24h	1
2026-05-23	34	20–68	8.6 µg/m³	17.9	24h	1
2026-05-22	42	31–60	10.3 µg/m³	20.9	17h	1

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