Abstract：
:Recently, PM2.5 (atmospheric fine particulate matter with aerodynamic diameter ≤ 2.5 μm) have received so much attention that the observations, source appointment and countermeasures of it have been widely studied due to its harmful impacts on visibility, mood (mental health), physical health, traffic safety, construction, economy and nature, as well as its complex interaction with climate. A review on the PM2.5 related research is necessary. We start with summary of chemical composition and characteristics of PM2.5 that contains both macro and micro observation results and analysis, wherein the temporal variability of concentrations of PM2.5 and major components in many recent reports is embraced. This is closely followed by an overview of source appointment, including the composition and sources of PM2.5 in different countries in the six inhabitable continents based on the best available results. Besides summarizing PM2.5 pollution countermeasures by policy, planning, technology and ideology, the World Air Day is proposed to be established to inspire and promote the crucial social action in energy-saving and emission-reduction. Some updated knowledge of the important topics (such as formation and evolution mechanisms of hazes, secondary aerosols, aerosol mass spectrometer, organic tracers, radiocarbon, emissions, solutions for air pollution problems, etc.) is also included in the present review by logically synthesizing the studies. In addition, the key research challenges and future directions are put forward. Despite our efforts, our understanding of the recent reported observations, source identifications and countermeasures of PM2.5 is limited, and subsequent efforts both of the authors and readers are needed.
journal_name
Environ Intjournal_title
Environment internationalauthors
Liang CS,Duan FK,He KB,Ma YLdoi
10.1016/j.envint.2015.10.016subject
Has Abstractpub_date
2016-01-01 00:00:00pages
150-70eissn
0160-4120issn
1873-6750pii
S0160-4120(15)30082-9journal_volume
86pub_type
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journal_title：Environment international
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journal_title：Environment international
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journal_title：Environment international
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journal_title：Environment international
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doi：10.1016/j.envint.2012.12.013
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journal_title：Environment international
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journal_title：Environment international
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