Get latest articles and stories on India at LatestLY. Delhi's air quality from January to April this year has been the best in the corresponding period since 2016, barring 2020 which saw a strict lockdown due to the Covid-19 pandemic, the Commission for Air Quality Management (CAQM) said on Sunday. India News | Delhi's Air Quality in Jan-Apr 'best' Since 2016, Barring 2020: CAQM.