Petronas Twin Towers are shrouded in haze in Kuala Lumpur, Malaysia, Sept. 10, 2019. Hundreds of schools were closed in Malaysia's Sarawak state after air quality dropped due to the ongoing haze, the state Education Department said on Tuesday. Air quality in several parts of the state were rated as "unhealthy" with the Air Pollution Index reading between 120 and 186 points, according to the country's Department of Environment. (Xinhua/Zhu Wei)