Abstract
Recently, air pollution by Particulate Matter 2.5 (PM2.5) has been inviting great social concerns due to its potential adverse effects on human health. Since PM2.5 is a complex media defined by particle size, corresponding particulate matter exists even in indoor environment. This paper overviewed toxicological and epidemiological studies on the aspect of human health effects of PM2.5 and summarized the present understandings. Sequence of events related to setting exposure limits on PM2.5 was also mentioned for the cases of USA, WHO and Japan.
