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flag Mumbai had the highest road traffic CO₂ emissions per kilometer among major Indian cities in 2021, at 5–6 tonnes per km.

flag Mumbai had the highest road traffic CO₂ emissions per kilometer among India’s major cities in 2021, according to a study published in Scientific Data. flag The research, part of the CHETNA project, found that high vehicle density drove emissions to 5–6 tonnes of CO₂ per km, surpassing Delhi, Bengaluru, Chennai, Pune, and Hyderabad. flag All cities showed elevated nitrogen oxides and carbon monoxide levels, with larger metros emitting more. flag Per capita CO₂ emissions remained under 0.2 tonnes annually across cities. flag The study used 500-meter resolution data and will inform future city dashboards, with a stakeholder workshop planned in Mumbai in February 2026.

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