The air pollution index in the capital, Kuala Lumpur, reached 258, the worst reading in the city since the haze first appeared two months ago.
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The first was an Air Pollution Index reading of 181, followed by 185, on a scale in which anything over 100 is considered very high.
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People in Hong Kong with heart or breathing problems were warned to stay indoors Wednesday as the government's air pollution index reached a record high.
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1974-- The Ontario Environment Ministry ordered Falconbridge Nickel Ltd . of Sudbury to temporarily close when the area air pollution index reached an extreme level.
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But in Miri, where Air Pollution Index readouts have been " hazardous " for weeks, the conditions have continued to worsen, reaching 438 on Sunday.
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The air pollution index remained critical Friday, dropping only slightly from the " very hazardous " range of 500 at sunrise to 429 by noon.
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In Malaysia, where authorities are considering declaring an environmental emergency, the air pollution index reached the unhealthy level of 101 to 200 in many parts.
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The Air Pollution Index rose to 121 in urban areas including Central, Wan Chai, Eastern, Kowloon City, Sham Shui Po, Wong Tai Sin, Yau Tsim Mong.
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In Miri, just south of Brunei, schools have been shut since March 30, when the Air Pollution Index shot to a " hazardous " 620 level.
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Forest fires in Indonesia pushed the air pollution index in Kuching on the Malaysian portion of Borneo island to an all time high on Tuesday, officials said.
