Green schools are taking initiatives to clean the polluted air around us As we gear up for winter, we cannot ignore that this is the time when we experience the worst of air quality across cities and towns. The air we breathe is filled with toxic pollutants like nitrogen dioxide (NO2), sulphur dioxide (SO2), carbon monoxide (CO), particulate matter (PM 2.5, PM 10), lead (Pb), ozone (O3), among others, arising from multiple sources such as vehicles, industries and power plants. Delhi has been infamous for its air pollution, for years, especially after the World Health Organisation reported it to be the most polluted city in …