New Delhi, Dec. 8 -- Winter quietly transforms the air around us, but not always for the better. As temperatures fall, the atmosphere becomes heavier and less active, which makes it easier for pollutants to settle close to the ground. This is why air quality often feels worse during the colder season. The stillness of winter air reduces natural ventilation and traps particulate matter, especially PM 2.5 and PM 10, creating a noticeable rise in pollution levels.

PM 10 is the larger form of particulate matter, made up of dust and visible debris that often settles on surfaces. You may notice it when you wipe a table or walk down a busy road. PM 2.5 is the much finer form, tiny enough to stay suspended in the air for longer periods and small...