PHNOM PENH, Jan. 25 (Xinhua) -- Cambodia on Saturday urged people to be extra vigilant against high air pollution, saying that they should wear masks for outdoor activities.

Seasonal air quality in the capital Phnom Penh and three other provinces, namely Banteay Meanchey, Koh Kong and Siem Reap provinces, had reached a "red level," meaning that air pollution was "high" in these regions.

The Ministry of Health said people should stay indoors when air quality in their areas is classified as high pollution (red level) or very high pollution (purple level), or when the sky is foggy caused by an increase in polluted air.

"Windows and doors should be closed to prevent bad air from entering your homes," the ministry said in a statement.

"People should reduce outdoor activities during periods of high air pollution or very high air pollution, or wear masks if it's necessary," the ministry added.

It said that infants, children, pregnant women, the elderly, and people with lung disease, cardiovascular disease and chronic disease are vulnerable to this polluted air. People with respiratory symptoms such as dyspnea, cough or exhaustion should visit doctors at the nearest hospital.

Meanwhile, the Ministry of Education advised students and teachers to wear masks properly when they are outdoors in order to avoid inhaling polluted air or dirt dust that can harm their health. Enditem

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