Houseplants for cleaning interiors of Delhi buildings

Areca Palm, Mother-in-Law's Tongue, Money Plant detoxify indoor air

Houseplants cleaning the world's smoggiest city - Delhi, that is.

The CEO of Paharpur Business Centre grows 400 plants in his office building's greenhouse to help clean its indoor air. The areca palm, mother-in-law's tongue, and the money plant are mostly used because of their complementary abilities to detoxify indoor air and enrich it with oxygen.
Refer http://news.nationalgeographic.com/news/energy/2014/12/141230-can-plants-really-clean-indias-air .
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"... He uses rainwater collected in cisterns to spray the trees so they can grow faster and absorb more pollutants. ..."
"... "Sustainability is good business, and energy efficiency is low-hanging fruit," says Meattle, whose 25-year-old building was India's first to earn the top rating (in 2010) for a retrofit from the U.S. Green Building Council. He says it uses one-fifth as much energy per square meter as the average office building in India. At least 10 percent of its energy savings is due to plants, which obviate the need to pump in ambient air.
His horticulture is also a practical nod to ancient tradition. "Why did Buddha sit under the peepul [or bodhi] tree?" he asks, adding that the sacred fig with heart-shaped leaves releases oxygen even at night, allowing those beneath a light sleep. ..."

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This is from December 2014.