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Air quality was categorised as "poor or very poor" on nearly 90 per cent of the total days in the four-month winter season this year, a study on Friday said and asserted that air pollution poses a serious threat to living standards in the national capital. "Not a single day in the four-month-long winter season was noted under the 'Good' air quality category, while a whopping 89 per cent of the total days were either under the 'Poor' or 'Very Poor' air quality category," said a bulletin on 'Ambient Air Quality for Delhi' released by Centre for Environment and Energy Development (CEED). "Six per cent of days are also observed with 'Severe' air quality. This poses serious threat to the living standards and public well-being of our national capital," the bulletin said.