In 2017, Smart Air analyzed PM2.5 data from the US Embassy pollution monitor in New Delhi. The data shows that winter air is the worst and PM2.5 level becomes hazardous. Yet summer is not safe either. Even the best months are far from levels that the World Health Organization considers safe (10 micrograms).
Click here to see our data analysis: https://smartairfilters.com/en/blog/delhis-air-pollution/