Beijing issued yellow pollution alert on Thursday, which was upgraded to orange on Friday, prompting city authorities to order 36 Beijing manufacturers to halt production and another 75 to reduce production in an attempt to clear the air a little. An orange alert — heavy to serious pollution — is issued when the air quality index (AQI) spikes to between 200 and 300 alternately for three consecutive days. (WHO)World Health Organization recommends 24-hour exposure to PM2.5 of no higher than 25 micrograms per cubic meter. Australian EPA shows colour code, black being more than 75, actually 1,629(!!), which is current for open cut mine fire in Morwell South!!
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