NationalDelhi’s air quality slips in ‘hazardous’ category as Diwali celebrations are onTestHostEntryNovember 5, 2021June 3, 2022 by TestHostEntryNovember 5, 2021June 3, 2022 As winters are approaching and Diwali was celebrated yesterday, National capital Delhi's Air quality has declined from 'severe' to 'hazardous'....