Union Environment Ministry said that Roadside air purifiers (WAYU) have failed to address air pollution at traffic intersections and dense traffic zones in Delhi.
About:
Developers: The National Environmental Engineering Research Institute (NEERI), a Nagpur-based laboratory of the Council of Scientific and Industrial Research (CSIR), had developed WAYU to address air pollution at traffic intersections and dense traffic zones.
Timeline: Prototypes of the device had been installed at the ITO Junction and Mukarba Chowk in north Delhi. Minister for Science and Technology Dr. Harsh Vardhan unveiled the prototypes in September 2018.
Working: It comprises a fan that sucks in air and sieves out dust and particulate matter using three filters of varying sizes. The air then moves into another chamber where carbon monoxide and hydrocarbons are oxidised into the less harmful carbon dioxide using activated carbon coated with titanium dioxide. The purified air is then released back into the atmosphere.
Features: Developers of WAYU claimed that the devices could reduce PM10 values from 600 micrograms per cubic metre (ug/m3) to 100 ug/m3; and PM2.5 values from 300 ug/m3 to 60 ug/m3 in 30 minutes.
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