Delhi wakes up to a grey sky again. The AQI has crossed 200, and the government has activated GRAP Stage 1 — the first level of the Graded Response Action Plan. Here’s what the numbers mean, why winter air turns toxic, and the simple steps that can protect your family.
Updated: October 18, 2026, 11:10 AM IST
Key takeaways
- Delhi’s AQI has crossed 200 — poor category — and GRAP Stage 1 is now active.
- At AQI 200+, everyone should limit outdoor exercise; N95 masks help on smog-heavy days.
- Run air purifiers in bedrooms, keep windows shut during morning smog, and protect children and the elderly first.
What AQI 200 actually means
The Air Quality Index runs from 0 to 500. Above 200 is officially “poor”: most people will notice breathing discomfort on prolonged exposure, and those with asthma, heart conditions or other sensitivities can see real effects. Delhi has now crossed that line, which is why GRAP Stage 1 has kicked in.
GRAP Stage 1 is the entry-level response: dust control at construction sites, stricter checks on polluting vehicles, and advisories to limit outdoor activity. Higher stages — up to Stage 4 — bring harsher measures like truck bans and school closures. Stage 1 is a warning shot: things can get worse before winter ends.
Why Delhi’s winter air turns toxic
Every October-November, the same forces converge. Cool air traps pollutants close to the ground — a phenomenon called temperature inversion. Stubble burning in neighbouring states sends smoke drifting in. Add Diwali fireworks, vehicle exhaust and construction dust, and the AQI climbs fast. Calm winds mean the smog doesn’t disperse; it just sits there, day after day.
Delhi’s geography makes it worse: the city sits in a natural bowl, ringed by hills on one side, so polluted air pools instead of blowing away. That’s why smog episodes can persist for weeks even when local emissions stay flat.
Who is most at risk
Children, the elderly, pregnant women and people with asthma, COPD or heart disease are hit first and hardest. Children’s lungs are still developing and they breathe faster relative to body weight, so they inhale more pollutants per kilogram. If someone in your family falls in these groups, treat AQI 200 days as red-alert days.
Protect your home: 7 practical steps
1. Seal the obvious leaks. Keep windows and doors shut during peak smog hours — typically early morning and late evening. Use damp towels along door gaps if you don’t have proper sealing.
2. Run a purifier where you sleep. One good HEPA purifier in the bedroom, run on high for an hour before bedtime, cuts indoor PM2.5 substantially. Keep the room door closed while it runs.
3. Wear N95 masks outdoors. Cloth and surgical masks don’t filter fine particles. N95 (or N99) masks do — wear one for commutes, school runs and any outdoor time on bad days.
4. Shift exercise indoors. Morning jogs and outdoor sports are the worst thing you can do at AQI 200+. Deep breathing during exercise pulls far more pollutants into the lungs. Move workouts inside until the air clears.
5. Watch the AQI, not the sky. A bright afternoon can still carry high PM2.5. Check a reliable AQI app before planning outdoor activities with children.
6. Keep medicines handy. Asthma and allergy patients should keep inhalers and prescribed medication accessible, and follow their doctor’s action plan. Don’t wait for symptoms to escalate.
7. Reduce your own emissions. Avoid burning waste, limit car trips where possible, and don’t add to the problem. Small collective actions keep the AQI from climbing further.
What GRAP Stage 1 changes for you
For most residents, Stage 1 means advisories rather than restrictions: dust mitigation at construction sites, mechanical road sweeping, and tighter pollution checks on vehicles. If the AQI keeps climbing, expect Stage 2 and beyond — which can include higher parking fees, bans on diesel generators and restrictions on truck entry. Watch official announcements rather than rumours.
Frequently asked questions
Is AQI 200 dangerous?
It’s officially “poor”: most people feel discomfort on prolonged exposure, and sensitive groups face real health risks. It’s not an emergency yet — but it’s the level where precautions become necessary, not optional.
Do air purifiers really help?
Yes — a properly sized HEPA purifier in a closed room can cut indoor PM2.5 by 50% or more. The bedroom matters most because you spend 7-8 hours there breathing the same air.
Should children go to school on smog days?
Follow official school advisories. If schools stay open, send children with N95 masks, ask about indoor recess, and watch for coughing or breathing difficulty.
