What is the air quality trend in Kolkata?

Over the past 8 days, Kolkata had an average AQI of 97 based on station measurements. The worst day was 2026-09-02 with AQI 132.

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.

103

Current AQI
Unhealthy for sensitive groups Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

164h

PM2.5 Station

164h · 96 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-09-05	94	88–104	32.3 µg/m³	18h	95
2026-09-04	95	90–102	32.8 µg/m³	24h	96
2026-09-03	109	100–114	38.9 µg/m³	24h	95
2026-09-02	132	112–198	61.0 µg/m³	22h	63
2026-09-01	116	75–178	46.6 µg/m³	23h	34
2026-08-31	76	70–82	24.1 µg/m³	24h	87
2026-08-30	74	70–81	23.0 µg/m³	24h	90
2026-08-29	83	82–84	27.4 µg/m³	5h	96

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