Pollutant levels higher than WHO prescribed limits Updated: Updated: This is despite a 15.6% dip in PM 2.5 level Share Article AAA Bengaluru recorded an average 15.6% dip in PM 2.5 levels. However, the pollutant levels were above the WHO prescribed limit in 46.7% of the days. | Photo Credit: SUDHAKARA JAIN This is despite a 15.6% dip in PM 2.5 level Despite widespread air quality improvements during 2019 and 2020, air pollution continues to be dangerously high, the annual data ‘World Air Quality Report, 2020’ compiled by IQAir has revealed. According to a press release, south Indian cities recorded relatively better air quality, though they remained above the daily WHO limit of 25 µg/m3 for most parts of 2020.