How Many Air Purifiers You Need During 600 AQI Delhi: Calculate As Per Your Need

When Delhi NCR goes into “hazardous” mode and the AQI crosses 600, this stops being a general lifestyle conversation. At that concentration, you’re not talking about “slightly polluted air” anymore — you’re dealing with airborne particulate density that’s closer to wildfire zones and chemical event ranges. And this is exactly where most people underestimate the maths. They think one single purifier is a magic dome. It isn’t. When the outside AQI is 600, your indoor air will keep recontaminating itself unless the air in each room is independently filtered. That’s why you need multiple units, not one clever one.

Why this is a tech sizing problem

The real variable isn’t brand or marketing claims. It’s CADR — Clean Air Delivery Rate.

It tells you, in cubic metres per hour, how fast your purifier can push clean air back into the room.

Higher CADR means faster air refresh cycles. And during peak smog, you need at least 4–5 full air changes per hour.

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The rule that matters

AHAM gives you the universal sizing math.

Room area (sq ft) ÷ 1.55 = minimum CADR

Example:
150 sq ft bedroom → needs CADR ~100
300 sq ft living space → needs CADR ~200

During an AQI 600 scenario, you want to overshoot this by at least 20–30 percent.

So how many air purifiers do you actually need in a 3BHK?

Typical Delhi NCR 3BHK ~1500 sq ft → realistic requirement:

Master Bedroom: 1 purifier 350–450 CADR

Second Bedroom / study: 1 purifier 350–450 CADR

Living + dining: 1 big unit 600+ CADR OR 2 medium CADR 350–450 units

That’s 3 to 4 machines.
Not 1. Not 2.
Three to four.

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How to deploy for maximum effect

- Keep windows shut during mornings/evenings — ventilate only around noon dips

- Place purifier near breathing zones, not in corners

- Turbo mode for 25 minutes before sleeping

- Expect filters to clog every 3–4 months in peak Delhi season

The bottom line

If you’re searching for “how many air purifiers are needed for my home in Delhi with 600 AQI,” the honest answer is three to four. Anything less is a placebo. This isn’t luxury consumption. This is basic survival engineering against particulate overload.