New Delhi, Oct. 29 -- At 11am Monday, concentration of PM2.5 in Delhi crossed the "severe" level. By 8pm, it reached 279ug/m. The permissible limit for the pollutant is 60ug/m. However, the Delhi pollution control committee (DPCC), said the peak PM2.5 level on post-Diwali day was 30% lower than 2018....