Abstract

Over the past two decades, Hong Kong and its adjacent Pearl River Delta of Guangdong Province have experienced booming economic growth. However, pollution abatement can not keep pace with the growth in population, economy, and industry. Particulate matter (PM), emitted directly to or formed secondarily in the atmosphere, can impact human health, visibility, and climate. The threat of PM, especially fine PM (PM2.5), which is primarily emitted from combustion sources and enriched in toxic chemical species, is well known. PM in Hong Kong has strong seasonality, with a low level in summer whereas a much higher level in colder seasons, since both local and regional sources contribute to the elevated levels. Motor vehicles, especially exhaust from diesel-powered vehicles, contribute significantly to PM pollution in Hong Kong and pose bigger health impacts due to the proximity of emission sources to the population. The urgent need to collaborate with its immediate neighborhood, Guangdong Province, to remedy Hong Kong's serious air pollution problem has been fully recognized. Such collaboration has already started, and the regional air quality monitoring network has been established.

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