A tourist waits to board a boat in Port Klang, Malaysia, March 14, 2014. The schools are closed on Friday because of the unhealthy air. The air pollutant index (API) of Port Klang, situated west to the capital Kuala Lumpur, hit unhealthy level on Friday, according to the website of the Department of Environment of Malaysia. (Xinhua/Chong Voon Chung) 

A boat is seen travelling in the haze in Port Klang, Malaysia, March 14, 2014. The schools are closed on Friday because of the unhealthy air. The air pollutant index (API) of Port Klang, situated west to the capital Kuala Lumpur, hit unhealthy level on Friday, according to the website of the Department of Environment of Malaysia. (Xinhua/Chong Voon Chung) 

Tourists walk near the Klang Royal Town Mosque in Port Klang, Malaysia, March 14, 2014. The schools are closed on Friday because of the unhealthy air. The air pollutant index (API) of Port Klang, situated west to the capital Kuala Lumpur, hit unhealthy level on Friday, according to the website of the Department of Environment of Malaysia. (Xinhua/Chong Voon Chung) 

Tourists with masks get off a boat in Port Klang, Malaysia, March 14, 2014. The schools are closed on Friday because of the unhealthy air. The air pollutant index (API) of Port Klang, situated west to the capital Kuala Lumpur, hit unhealthy level on Friday, according to the website of the Department of Environment of Malaysia. (Xinhua/Chong Voon Chung) 

The Klang Royal Town Mosque is seen in the haze in Port Klang, Malaysia, March 14, 2014. The schools are closed on Friday because of the unhealthy air. The air pollutant index (API) of Port Klang, situated west to the capital Kuala Lumpur, hit unhealthy level on Friday, according to the website of the Department of Environment of Malaysia. (Xinhua/Chong Voon Chung) 

A security guard stands next to a school gate in Port Klang, Malaysia, March 14, 2014. The schools are closed on Friday because of the unhealthy air. The air pollutant index (API) of Port Klang, situated west to the capital Kuala Lumpur, hit unhealthy level on Friday, according to the website of the Department of Environment of Malaysia. (Xinhua/Chong Voon Chung)