GS Paper - 3 (Environment)

After a smog tower became operational in Connaught Place on 23 August 2021, an over-20m-high towerDelhi’s second major similar facility — was inaugurated in Anand Vihar, which is among the city’s most polluted locations.


  1. Funded by the Centre, this tower in east Delhi, too, has been developed on the same methodology as the CP tower, a Delhi government project.
  2. Union minister for environment, forest and climate change Bhupender Yadav virtually inaugurated it on the second International Day of Clean Air For Blue Skies.
  3. The tower, proposed by IIT-Bombay, is downdraft type — polluted air comes in from the top of the tower and clean air comes out from the bottom — for localised reduction of PM2.5 and PM10.
  4. The filter system, a novel geometry filtration system, has been designed by University of Minnesota, and is to work with an efficiency of 90%. Forty fan units have been installed to provide a designed airflow rate of 1,000m3/sec.
  5. The tower has been built by Tata Projects Limited with NBCC (India) Ltd as the project management consultant. IIT-Bombay, in collaboration with IIT-Delhi, will validate its performance.
  6. An advisory committee, headed by the chairman of Central Pollution Control Board and comprising of experts from IITs, NEERI, MoEF&CC, Engineers India Limited, NTPC and NBCC, has been constituted to oversee the progress, review the performance and guide on improvement and optimisation.
  7. Outdoor air purifiers were earlier installed in Lajpat Nagar, Krishna Nagar and Gandhi Nagar.