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Devices to Control Air Pollution

  • 14 Nov 2019
  • 2 min read

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The air purifiers installed on the roads and on top of the buses have failed to combat air pollution in Delhi NCR.

  • The air purifying devices include WAYU (Wind Augmentation PurifYing Unit) and High-Efficiency Particulate Arrestance (HEPA) filters.

WAYU (Wind Augmentation PurifYing Unit)

  • It is developed to address air pollution at traffic intersections and dense traffic zones.
  • It has been indigenously developed by the Council of Scientific and Industrial Research - National Environmental Engineering Research Institute (CSIR-NEERI).
  • The device has the capacity to purify the air in an area of the 500-meter square. It is energy efficient and has a low maintenance cost.
  • The device works on two principles :
    • Wind generation for dilution of air pollutants: It comprises a fan that sucks in air and removes dust and particulate matter.
    • Active Pollutant removal: The carbon monoxide and hydrocarbons are oxidized into less harmful carbon dioxide using activated carbon coated with titanium dioxide.

High-Efficiency Particulate Arrestance (HEPA) filters

  • These filters are able to trap 99.97 % of particles that are 0.3 microns.
  • It traps air contaminants in a complex web of fibers.

Source: TH

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