Kolkata, India

Daily Pollution Levels on

PM2.5 Concentration

Meets National Standard (60 µg/m³)

Meets WHO Guideline (15 µg/m³)

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Annual Average Pollution Levels in Kolkata

Source: Air Quality Life Index

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Kolkata Weekly Cigarettes

Note: These are estimations based on Berkeley Earth’s “Air Pollution and Cigarette Equivalence,” https://berkeleyearth.wpengine.com/air-pollution-and-cigarette-equivalence/

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Top 10 Threats to Life Expectancy in India

Threat to Life Expectancy

Life Years Lost
0-0.1

0.1-0.5

0.5-1.0

1.0-2.0

2.0-3.0

3.0-4.0

Source: Global Burden of Disease (https://vizhub.healthdata.org/gbd-results/), level-2 causes and risks data and WHO Life Tables (https://apps.who.int/gho/data/node.main.LIFECOUNTRY?lang=en), were combined with the Life table method to arrive at these results. ‘PM2.5 relative to WHO Guideline’ bar displays the reduction in life expectancy relative to the WHO guideline as calculated by latest AQLI (2023 PM2.5 concentrations) data.

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In the News

In the News·Aug 25, 2025

Kolkata beats other metros, reports more than 50% of good air days in 4 years: CSE study

via Times of India
Kolkata has emerged as the metro with the best air quality among six major Indian cities.
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In the News·Aug 25, 2025

How India moves: Surge in lung ailments in Kolkata as vehicle emissions choke city

via Down to Earth
Annual four-wheeler registration rose five times since 2016; public transport at the brink of breaking down.
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In the News·Aug 25, 2025

PM 2.5 in 2024-25 winter Kolkata’s best since 2019

via Times of India
This winter brought a breath of relatively cleaner air to Kolkata, with the city recording its best particulate pollution levels since 2019.
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In the News·Aug 26, 2025

Kolkata study finds air toxicity surges when PM2.5 breaches 70 µg/m³, threshold exceeds on 75% of winter days

NCAP fails to curb PM2.5 from waste burning — a major air pollutant in the West Bengal megacity — despite spending over Rs 636 crore.
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In the News·Aug 27, 2025

Kolkata has second worst air among India’s metros. What it needs to do to breathe better

via Telegraph India
Bengal capital’s air quality improved marginally last year, but the city is still second most polluted among Indian metros despite fewer industries, vehicles. Experts explain the reasons, and what needs to be done.
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In the News·Aug 27, 2025

How Kolkata improved its air quality within 6 years

via The Indian Express
In 2019, Kolkata was listed among the Top 10 most polluted cities by the National Clean Air Programme.
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