New Delhi, Nov. 14 -- It's that time of year when air pollution grabs headlines, and AQI becomes dinner table conversation. The worry, however, is no longer confined to the capital. It extends to other cities, where vehicle exhaust, heavy industry, thermal power plants, and construction contribute to air pollution throughout the year.

Consequently, clean air is becoming a household budget item, with more families considering air purifiers to reduce indoor pollution. And since a purifier comes with ongoing costs, it pays to be smart about the purchase. Ananya Grover spoke to experts about what a purifier costs and what buyers should keep in mind. For instance, a suitable purifier for a room larger than 150 square feet can cost up to Rs.18...