What is the air quality trend in Kolkata?

Over the past 7 days, Kolkata had an average AQI of 78 based on station measurements. The worst day was 2026-07-20 with AQI 88.

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.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

86h

PM2.5 Station

86h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	70	61–91	21.4 µg/m³	11h	1
2026-07-20	88	68–93	29.8 µg/m³	16h	73
2026-07-19	83	72–96	27.3 µg/m³	15h	50
2026-07-18	74	59–87	23.1 µg/m³	13h	1
2026-07-17	81	66–117	26.4 µg/m³	12h	1
2026-07-16	76	58–132	23.5 µg/m³	8h	1
2026-07-15	80	65–104	25.7 µg/m³	11h	1

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