89 per cent of the total days were either under ‘poor’ or ‘very poor’ category.
New Delhi: Delhi did not see a single "good" air quality day during the four-month long winter period, said a study on Friday. Air quality was categorised as ‘poor or very poor’ on nearly 90 per cent of the total days in the four-month winter season. Six per cent of the days also saw ‘severe’ air quality.
