Schools in and around Mexico City have been ordered to shut down on Thursday due to rising levels of air pollution.
In a statement, the education ministry said all public and private schools in the Mexico City metropolitan area will be closed, and urged children to remain indoors.
Two of the city's main universities also suspended classes in the metropolitan area on Thursday.
On Tuesday, authorities declared an environmental emergency in response to a sharp rise in air pollution caused by brush fires.
President Andres Manuel Lopez Obrador called the situation "highly regrettable".

Tanzania's Hassan declared landslide winner in election marred by violence
Vietnam's ancient town Hoi An works to restore tourism after devastating floods
Indian temple stampede kills nine, injures several
Turkey to host Gaza meeting amid ceasefire concerns
Tanzania opposition says hundreds killed in vote protests
Turkey sentences 11 people to life in prison over ski resort hotel fire
China sends its youngest astronaut to 'Heavenly Palace' space station
Israel launches more strikes on Gaza overnight, testing fragile truce
