New Delhi, Dec. 17 -- Strong surface winds came to Delhi's aid on Tuesday, snapping a three-day streak of "severe" air and improving the air quality index to "very poor" level. However, analysis of long-term data shows that the worst may not yet be over, as further changes in meteorology and dipping temperatures are likely to worsen air quality by the month-end. On Tuesday, blue skies were briefly visible during the day, as sunshine and winds of up to 15kmph helped disperse pollutants, which was in stark contrast to the day before, when dense fog and heavy pollution enveloped the city in a smog blanket, with AQI reeling at 427. Delhi's 24-hour average AQI on Tuesday was 354 ("very poor") at 4pm. By 7pm, it had improved further to 341, accor...