Beijing is seeking to tame its smog by preparing emergency measures such as factory shutdowns and traffic limits that will kick in when air pollution levels are especially heavy, the South China Morning Post reported on Tuesday. The municipal government was quoted as saying that strict measures will take effect when the smog index for fine particulate matter, PM2.5, is forecast to exceed 300 micrograms per cubic meter for three days running. The World Health Organization safe limit is 25 micrograms. Private vehicles will be allowed to operate only on alternating days, depending on the last number of their license plates. Factory emissions will be cut 30 per cent by suspending or limiting production, and construction sites must halt excavation and demolition, the report said.
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