Delhi smog tower cleans air, but test continue on efficacy and range
Hindustan TimesPreliminary data submitted by the Indian Institute of Technology Bombay to the Delhi Pollution Control Committee shows a 50-60% reduction in PM 2.5 concentration, but only between the inlet and the outlet of the smog tower installed at Connaught Place earlier this year. Experts have long argued that smog towers are not a long-term solution to Delhi’s air pollution problem, and that not only would people have to remain extremely close to the smog tower to breathe clean air, but thousands of such smog towers would have to be installed all across the city to bring about a change in air quality. When HT visited the smog tower the following day, when Delhi’s air quality index was 311, the giant screen outside the tower displayed the outside PM 2.5 concentration to be 140 micrograms per cubic metre, with the treated air having a concentration of 73 micrograms per cubic metre. Similarly, on HT’s visit on December 2, when AQI was 429, the smog tower displayed a PM 2.5 concentration of 460 micrograms per cubic metre outside the tower, while the controlled air was said to have a PM 2.5 concentration of 324 micrograms per cubic metre.