New Delhi, Nov. 15 -- The Capital's 24-hour average air quality remained close to the "severe" level, as it clocked an air quality index (AQI) of 367 ("very poor") on the Central Pollution Control Board's daily bulletin-marginally lower than the AQI of 373 recorded the day before, amid 17 of 59 air quality monitoring stations clocking severe AQI readings of over 400. The India Meteorological Department (IMD) has predicted very light rainfall on Sunday morning. The maximum temperature in the Capital was 30.4degC, which was 2.3degC above normal, and the minimum was 16.4degC, which was 2.9degC above normal. Visibility at Safdarjung, Delhi's base weather station, deteriorated sharply overnight, dropping from 2,000 metres at 5.30pm on Friday to 350 metres by 2.30am on Saturday, according to IMD. The IMD classifies visibility below 50 metres as "very dense" fog, 50-199 metres as "dense" fog, 200-499 metres as "moderate" fog and 500-999 metres as "shallow" fog. Meanwhile, CPCB data showed that PM2.5 (finer particulate matter) continued to be the major pollutant at 52 stations. On Saturday afternoon, the weather worked against clearing Delhi's air, according to an HT analysis of IMD's weather-balloon readings from Safdarjung. By 4.30pm, the sun had mixed the pollution about 1,450 metres up, close to the usual 1,300 for early November. But the wind through that layer averaged 11 km/h, less than the usual 13. The reading was only just below the level counted as borderline dispersal. On Friday too, similar conditions worked to prevent the clearing of air. Meanwhile, NASA's satellite detected 48 farm fires in Punjab and Haryana on Saturday (Punjab 44, Haryana 4), down from 58 recorded the day before....