The Ukrainian capital city of Kyiv again tops the live Air Quality and Pollution City Ranking as the city with the dirtiest air.
As of 09:45 on April 24, its US Air Quality Index (AQI) is the highest one (155).
Kyiv is followed by India's Delhi with 141, Nepal's Kathmandu with 122, Kuwait's Kuwait City with 120, and Belgium's Brussels with 117, the ranking shows.
Earlier, Kyiv City State Administration explained the phenomenon by wildfires in Zhytomyr region and forest fires in the Chornobyl Exclusion Zone, coupled with northwest wind gusts.
The local authorities call on residents of Kyiv to limit time spent outdoors, keep windows shut (especially at night and early in the morning), use air conditioning equipment and air purifiers, drink up to three liters of water (for adults).