Hong Kong, Guangdong and Macau will include one more air pollutant in a regional monitoring network in a bid to cut smog levels.Volatile organic compounds (VOCs) will be covered by the Pearl River Delta Regional Air Quality Monitoring Network, which collates data from 23 monitoring stations and is part of a joint effort by the three governments.Before the inclusion of VOCs, the network monitored five other air pollutants: sulphur dioxide, nitrogen dioxide, carbon monoxide, respirable suspended…
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