Worst air pollution Kolkāta, today and tomorrow
Today (9 August): Air quality in Kolkāta is fair. PM2.5, O3, SO2, and PM1 are fair; AQI and NO2 are medium; PM10, CO, and HCHO are good. Pollution peaks around 11:30 PM (NO2: 42.1/100).
Tomorrow (10 August 2026): Air quality in Kolkāta is poor. AQI worsens to poor; PM2.5 decreases to medium; NO2 increases to poor; O3 decreases to medium; SO2 decreases to medium; PM1 decreases to medium; all other pollutants stay as today. Pollution peaks around 10:30 PM (NO2: 62.6/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Kolkata's air quality reflects the flat Ganges delta's enclosed alluvial plain position, with vehicle traffic on the VIP Road and the surrounding manufacturing, jute, and industrial corridor generating elevated PM2.5. The Bay of Bengal monsoon provides effective wet season cleansing from June to September, while the dry winter northeast monsoon transports polluted continental air from the Indo-Gangetic Plain and Kolkata's flat topography with minimal natural dispersal maintains consistently elevated readings, particularly during the October to March dry season throughout the year.
Today - 9 August | Pollution peaks at 23:30
AQI:
Medium
42.1/100
PM2.5 (fine particles):
Fair
22.7/100
PM10 (coarse particles):
Good
6.9/100
NO2 (nitrogen dioxide):
Medium
42.1/100
O3 (ozone):
Fair
27.1/100
SO2 (sulfur dioxide):
Fair
33.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.2/100
PM1 (ultrafine particles):
Fair
26.2/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 22:30
AQI:
Poor
62.6/100
PM2.5 (fine particles):
Medium
40.1/100
PM10 (coarse particles):
Good
11.9/100
NO2 (nitrogen dioxide):
Poor
62.6/100
O3 (ozone):
Medium
44.2/100
SO2 (sulfur dioxide):
Medium
48.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
11.4/100
PM1 (ultrafine particles):
Medium
42.6/100
Frequently Asked Questions
Is air quality bad in Kolkāta right now?
On 9 August 2026, overall air quality in Kolkāta is fair. SO2 is the main pollutant at 33.2/100. Pollution peaks around 11:30 PM (NO2: 42.1/100).
Will air quality be worse tomorrow in Kolkāta?
On 10 August 2026, air quality conditions in Kolkāta will be worse than today, with AQI forecast at poor at 62.6/100. Pollution peaks around 10:30 PM (NO2: 62.6/100).
When is air pollution at its worst in Kolkāta?
The biggest local contributors to pollution in Kolkāta are traffic on the surrounding roads along with textile and manufacturing operations, particularly once dry, windy weather picks up. These wind events can carry dust in from the surrounding arid landscape. Rains during the wetter months typically wash pollutants out of the air.
Are air quality levels in Kolkāta based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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