What is the air quality trend in Kolkata?

Over the past 8 days, Kolkata had an average AQI of 138 based on station measurements. The worst day was 2026-10-16 with AQI 178.

How is Kolkata air quality measured?

Air quality in Kolkata 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 Kolkata, India

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

Historical PM2.5 and AQI trend from monitoring stations near Kolkata, India.

112

Current AQI
Unhealthy for sensitive groups Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

114h

PM2.5 Station

114h · 93 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	112	111–112	39.7 µg/m³	2h	92
2026-10-20	112	87–144	39.8 µg/m³	17h	37
2026-10-19	113	81–151	40.3 µg/m³	12h	1
2026-10-18	115	109–135	41.0 µg/m³	9h	73
2026-10-17	148	89–196	81.4 µg/m³	19h	23
2026-10-16	178	132–189	108.8 µg/m³	19h	1
2026-10-15	153	78–179	80.1 µg/m³	18h	6
2026-10-14	176	138–192	104.6 µg/m³	18h	2

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