New Delhi, March 13 -- Fine particulate matter could be absorbing moisture from Delhi's humid air during winters, which could result in an underestimation of the city's PM1 pollution by up to 20 per cent, according to a new study.
Researchers, including those from the University of Birmingham, UK, explained that the swelling of fine particulate matter by absorbing water from the humid air - hygroscopic growth - reduces the efficiency of sampling devices, possibly leading to underestimation.
The study, published in the journal npj Clean Air, "fills in the gap in the understanding of PM1 pollution in the most polluted megacity in the world."
New Delhi remained the world's most polluted capital city, according to the 2024 World Air Quality ...