New Delhi: There are a number of factors to consider when choosing air purifiers, including size and layout of the room, the clean air delivery rate, noise levels, maintenance costs, and the quality of the companion app. It is taken for granted that the purifier has to use HEPA filters, capable of capturing and filtering out fine particles of dust, smoke and pollen. Those suffering from asthma, allergies or sleep apnea can also look at the air changes per hour (ACH) rate, with a higher number being better. Then there are additional features such as timers, and heating or cooling capabilities, that can be tested.

The Delhi Government has issued a tender to set up air purifiers at various locations in the Delhi Sachivalaya building, with Supply, Installation, Testing, and Commissioning (SI

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