SO₂ in India

Sharp-smelling gas from burning sulphur-containing fuels — primarily coal. India is the world's largest emitter of SO₂.

Live SO₂ levels — top Indian cities right now

Where SO₂ comes from

• Coal-fired power plants (largest source)
• Oil refineries
• Metal smelters
• Diesel vehicles

How SO₂ harms human health

• Constriction of airways and breathing difficulty
• Severe symptoms in asthmatics
• Eye, nose and throat irritation
• Contributes to PM2.5 formation downwind

What you can do

Reduce personal exposure with N95 masks during peak hours, run a HEPA purifier indoors, and switch to clean transport where possible. Push for systemic change: file an RTI, attend NCAP city consultations, demand transparent station data from your municipality.

Set SO₂ alerts for your city →

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