Post-Doctoral Researcher,University of Birmingham, United KingdomRecently, with accelerated urban development and modernization, air pollution is worsening and its impact on human health has become a main research topic. Air pollutants include gaseous pollutants and particle matters (PM). It has been found that PMs with an aerodynamic diameter smaller than 10 µm have a greater impact on human health. One group of PM identified, PM2.5, have small diameters, however large surface areas and may therefore be capable of carrying various toxic stuffs, passing through the filtration of nose hair, reaching the end of the respiratory tract with airflow and accumulate there by diffusion, damaging other parts of the body through air exchange in the lungs. Recently, a growing number of studies in toxicology, epidemiology and other related fields have demonstrated that respirable particles are closely related to the incidence of human diseases and mortality rate.
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