January may have given the city a feel of winter, but the chill comes with a nasty sidekick: heavy air pollution. The drop in temperatures has seen cold air trap pollutants, forming a haze that spells major health trouble for many.

In the last 15 days, the concentration of suspended particulate matter in the air has almost doubled. Till date, every third day this month has seen RSPM levels at twice the acceptable maximum or close to it. The levels have been over the permissible limit for the last one month.