Can an N95 mask protect you from Delhi's polluted air? Chest specialist explains what most people get wrong

With Delhi's Air Quality Index (AQI) entering the 'poor' category, wearing a mask outdoors has become an important consideration for residents looking to reduce their exposure to polluted air. Fine particulate matter, particularly PM2.5, can penetrate deep into the lungs, while repeated exposure to polluted air can trigger coughing, throat irritation, wheezing and breathing difficulties, even in people without pre-existing medical conditions.