The Environmental Protection Department issued a statement yesterday morning pointing out that its air pollution indices at roadside air quality monitoring stations reached a "very high" level. However, turning to the Hedley Environmental Index (HEI), we see that it described air pollution over Hong Kong more graphically as being "very dangerous".
via Business feed http://www.scmp.com/business/article/1339107/how-much-longer-action-roadside-pollution
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