Health risk category for Air Quality Health Index reached "Serious" level

The Environmental Protection Department (EPD) has recorded higher than normal air pollution levels since this morning (October 21), and the health risk category of the Air Quality Health Index (AQHI) at some air quality monitoring stations has reached the "Serious" level. Winds are weak over Hong Kong today, which are unfavourable for pollutant dispersion. The intense sunshine enhances photochemical smog activity, leading to the rapid formation of ozone and fine particulates in the Pearl River Delta region. The high ozone level also promotes the formation of nitrogen dioxide. According to the Hong Kong Observatory, a northeast monsoon is expected to affect the coast of southern China later today. It is expected that air quality will improve by then. With a health risk category in the "Very High" range or above, children, the elderly and persons with existing heart or respiratory illnesses are advised to reduce physical exertion and outdoor activities to a minimum or avoid such activities. The general public is advised to reduce, or reduce to a minimum, outdoor physical exertion, and to reduce time outdoors, especially in areas with heavy traffic. As health effects of air pollutants

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