India, June 28 -- The Delhi government will install 150 outdoor air purifiers at Nehru Park in a pilot project aimed at creating the city's first "clean air zone," environment minister Manjinder Singh Sirsa said, outlining a plan that experts called unviable and impractical.

Sirsa said the devices, upto nine-feet-tall PM 2.5 particulate matter filters, will be spread across the 85-acre park and maintain "good" air quality even during peak pollution periods.

"This initiative is part of the government's efforts to improve air quality in the city. It will be a first-of-its-kind pilot project in the country to improve air quality at a public park," Sirsa told HT.

The announcement comes as Delhi has grappled for years with hazardous air pol...