Combination picture shows a portion of Kathmandu valley as the air quality of Kathmandu reached hazardous...
A combination picture shows a portion of Kathmandu valley, during a smoggy day on January 5, 2021, and after the smog was cleared away a day after, as the air quality of Kathmandu reached hazardous levels, in Nepal, January 6, 2021. REUTERS/Navesh Chitrakar