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Philips 4200 Series Pro air purifier is a touch above par vis-à-vis competitors
The core consists of two fans instead of one, dual four-layer filters, and two activated carbon layers instead of one. The result is it cleans high AQI rooms faster, than some more expensive purifiers.

Air purifiers aren’t enough: 4 simple habits to breathe cleaner air indoors
You won’t believe what’s in your indoor air. Here are four easy ways to purify your space.

Buying an air purifier? Here are 5 things you must check
With Delhi's air quality at 226, choosing the right air purifier is crucial. Consider room size, effective filtration technologies, and ongoing costs.

With washable MESP filter, Nirvana Being’s air purifier saves money and e-waste
An MESP filter has a life of 10 years or so. Average that with swapping out HEPA filters once a year, and assuming an average cost of replacement filters to be around ₹3,000, you’ll be saving around ₹30,000 over the same period

Delhi’s smog tower impact too little, too close: Report
At best, roughly 500m away and in a downwind direction, there was an 18% improvement in the amount of dust and ultrafine PM.
