Abstract
PM2.5 pollution has become a severe problem in China due to rapid industrialization and high energy consumption. It can cause increases in the incidence of various respiratory diseases and resident mortality rates, as well as increase in the energy consumption in heating, ventilation, and air conditioning (HVAC) systems due to the need for air purification. This paper reviews and studies the sources of indoor and outdoor PM2.5, the impact of PM2.5 pollution on atmospheric visibility, occupational health, and occupants’ behaviors. This paper also presents current pollution status in China, the relationship between indoor and outdoor PM2.5, and control of indoor PM2.5, and finally presents analysis and suggestions for future research.
Highlights
In recent years, hazy weather caused by multiple pollutants, with PM10 and PM2.5 as the main pollutants, has affected large areas of China, lasting for a long time
According to the data collected from the air quality monitoring stations in 338 big cities in China, the range of annual average concentrations of PM2.5 in 2015 in the 388 cities was 11–125 μg·m−3 with an average value of 50 μg·m−3
Compared with the coarser particles, PM2.5 is smaller in size, larger in surface area, and more transported, which implies more toxicity and harmful substances that can penetrate deep into the human body
Summary
Hazy weather caused by multiple pollutants, with PM10 (cutoff sizes ≤ 10 μm, inhalable particles) and PM2.5 (cutoff sizes ≤ 2.5 μm, particles that can enter the lungs) as the main pollutants, has affected large areas of China, lasting for a long time. In 2016, the average annual concentration of PM2.5 was 12–158 μg·m−3 , with an average value of 47 μg·m−3 , and PM2.5 was the main pollutant for more than 80.3% of the days with severe pollution [2,3]. It has always been a hot topic in various related research fields around the world
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