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Quick guides and simple explainers for understanding pollution, AQI, and cleaner daily habits.

Split image of a Delhi road choked with exhaust-emitting cars beside an elevated Delhi Metro train, overlaid with a chart comparing in-traffic PM2.5 against ambient AQI
Data Stories6 min read

Traffic, Time, and PM2.5: How Delhi's Commute Is Quietly Changing Your Health

You've checked the Delhi AQI today. It says 180 — "Unhealthy." You figure it's manageable. You get in your car or hop on a bus and navigate the morning gridlock. What you probably don't know is that your actual PM2.5 exposure during those 45 minutes in traffic was likely 2 to 3 times higher than what the monitoring station reported.

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A desk by a window with a laptop, notebook and coffee mug, split between a hazy grey city and a clear green skyline, with a lung-shaped tree dissolving into soot on the polluted side
Data Stories6 min read

Air Quality and Productivity: The Hidden Cost of Breathing Bad Air at Work

You've probably blamed a slow workday on bad sleep, too much coffee, or the quarterly review looming on your calendar. But there's another variable almost no one factors in — the air you're breathing right now.

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Illustration of a mother and young son looking out over a hazy Indian city skyline, with clearer blue sky breaking through above the smog
AQI Basics6 min read

The Air Your Children Are Breathing: What Parents in Indian Cities Need to Know

Children breathe roughly 50% more air per kilogram of body weight than adults, and their lungs are still forming. In a city where the AQI regularly crosses 200, that is a daily calculation every parent is making — whether they realize it or not.

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Clean air success stories from Beijing, London, and Bogotá, shown as bright city skylines viewed through a wide window
Data Stories7 min read

The Cities That Breathed Again: Clean Air Success Stories From Around the World

Ten years ago, you couldn't see the mountains from Beijing's city center. Today, on many days, you can. That's not a metaphor. It's measured, documented, and replicable. It's one of the most under-told environmental stories of our time.

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A silhouetted profile against a smog-choked Delhi skyline at sunrise, India Gate visible through the haze with autumn leaves drifting
Air Quality Science7 min read

Delhi's Invisible Winter: What Really Happens to the Air Between October and February

Every October, like a slow-motion alarm clock, Delhi's air begins its winter deterioration. The city hasn't changed overnight. The factories haven't multiplied. The cars haven't doubled. But the AQI starts climbing – 100, 150, 200 – and by November, on the worst days, the numbers scroll past 400 while the sky turns the colour of weak tea. What's happening? The honest answer is more complicated than the stubble burning debate suggests.

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India's air quality divide: Delhi, Mumbai, Bangalore and Kolkata skylines with their contrasting AQI readings over a map of India
Data Stories7 min read

India's Air Quality Divide: Why Mumbai, Bangalore, and Kolkata Experience Pollution So Differently

Mention "India and air pollution" and most people picture Delhi. That framing is both understandable and incomplete. India is a continent masquerading as a country, and its air quality story is fractured, regional, and shaped by factors as different as monsoon geography and industrial legacy.

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A smart AQI monitor reading 147 against a hazy city skyline, beside an N95 mask
AQI Basics6 min read

The AQI Number You've Been Misreading (And What It Actually Means for Your Body)

You've seen the number — 147, 312, 78 — on a weather app or a headline about Delhi. But do you actually know what it means for what's happening inside your lungs right now? Most people don't, and it's not their fault.

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