The progress of the association between different diameter of outdoor particulate matter and asthma

Outdoor particulate matter can affect human health seriously, and children are possibly susceptible to the effects of particulate matter because of the characteristics of the growth and development.Particulate matter is categorized into total suspended, inhalable, fine, and ultrafine fractions on the basis of its aerodynamic diameter.To explore the short-term effects of particulate matter on pediatric asthma, this article reviews the components and property of particulate matter, the possible mechanisms and the epidemiological studies of particulate matter on children with asthma. Key words: Air pollution; Particulate matter; Children; Asthma