The level of emissions from fireworks fell by around 40 per cent during Diwali festivities this time as compared to 2016, according to the findings of a study which assume importance in the light of a region-wide ban on the sale of firecrackers by the Supreme Court.<br/>'<br/>The SAFAR study concluded that, as a whole, the Diwali period (October 18-22) was the cleanest since 2014. Level of particulates did shoot up a day after Diwali, but the dispersion was quicker and air quality attained the pre-Diwali level within three days.<br/>'<br/>SAFAR, a central government air quality monitoring agency, based its findings on a detailed study of air quality, sources of emissions and meteorological conditions which prevailed in the national capital during this period.<br/>