It’s that time of the year when Delhi becomes a gas chamber. It’s a scary and dangerous time for all, especially the elderly, children, pregnant women and people with compromised lung function. This is when an anti pollution mask comes handy. It not only lets you breathe easy but also filters out the toxic pollutants present in the air. An anti pollution mask is a necessity for Delhities who have been falling prey to this ever rising menace of pollution. But not all masks are equipped to protect you completely. A well informed decision should be taken before purchasing the mask. Here are few important points to be considered before buying an anti pollution mask: 1: Always look for the rating of the mask. N95, N99, N100, P95 and P100 are the ratings available. The ratings quantify how much pollutant each of them can filter. An N95 mask filters 95 per cent of PM2.5 while N99 and N100 are capable of filtering 99 per cent and 99.7 per cent pa...