Passengers wearing masks take the subway in Singapore, Sept. 29, 2015. The three-hour Pollutants Standard Index (PSI) of Singapore hit 250 at 2 p.m. local time on Tuesday and reached the "very unhealthy" level. (Xinhua/Then Chih Wey)
Singapore's three-hour PSI reaches "very unhealthy" level on Tuesday
English.news.cn
2015-09-29 20:29:10
[Editor: hanyang]
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