Kamal Meattle shows how an arrange­ment of three com­mon house­plants, used in spe­cific spots in a home or office build­ing, can res­ult in meas­ur­ably cleaner indoor air.

With its air-filtering plants and sus­tain­able archi­tec­ture, Kamal Meattle’s office park in New Delhi is a model of green busi­ness. Meattle him­self is a long­time act­iv­ist for clean­ing up India’s air.