IIT Kanpur's 7-year study finds PM 2.5 peaking in November third week

Delhi's air quality worsens between October and January. PM 2.5 levels peak in November's third week. The period from 10 pm to 11 am has the worst air quality. Daytime hours are better for outdoor activities. Pollution increases in October and peaks in November and December. Stricter measures are needed before November to improve air quality.