India, Nov. 3 -- Delhiites breathed the season's worst PM2.5 on the morning of November 3, 2019

Delhi on November 3, 2019 was shrouded in toxic haze as air pollution levels were completely off the charts.

Alarmingly, the level of particulate matter (PM) in the air was at least seven times more than the prescribed World Health Organisation (WHO) standard. In fact, Delhiites breathed the season's worst PM2.5 on Sunday morning. These ultrafine particles are capable of entering the respiratory system and reach the bloodstream through human lung and blood tissues.

While overall Air Quality Index (AQI) according to SAFAR (System of Air Quality and Weather Forecasting And Research) website, under the Union Ministry of Earth Sciences, was reco...