Analysis on the pollution characteristics and influence factors of PM_(2. 5) in Shenzhen City in 2016

OBJECTIVE: To explore the pollution characteristics and possible influence factors of PM_(2. 5)in Shenzhen in 2016. METHODS: The dynamic characters of PM_(2. 5)mass concentration were analyzed using air quality monitoring and meteorology observation data. The correlations between PM_(2. 5)and other affecting factors, e. g. gas pollutions and meteorology factors, were discussed. A multiple linear regression model was built to reveal the impacts of those factors on PM_(2. 5)concentrations in Shenzhen City using the air quality monitoring and meteorology observation data. RESULTS: The mass concentration of PM_(2. 5)was(27. 02±13. 88)μg/m~3, and the ratios of PM_(2. 5)/PM_(10)was(0. 62±0. 08)in Shenzhen City. Significant positive correlations existed between PM_(2. 5)concentration and main airpollutants(NO_2, SO_2, CO and O_3)(P<0. 05). A significant negative correlation existed between PM_(2. 5) concentration and temperature, relative humidity(P<0. 05), and also a significant positive correlation between atmospheric pressure and PM_(2. 5)concentration. The multiple linear regression showed that air pollutants(NO_2, SO_2, CO, and O_3)and atmospheric pressure could explain 86. 7% of the variations of PM_(2. 5)concentration. The standard regression coefficient of CO in the model was the highest(0. 439). CONCLUSION: PM_(2. 5)pollution was relatively light in Shenzhen City, and PM_(2. 5)was the main component of inhalable particulate matter. Atmospheric pressure and other pollutants in the atmosphere were the main influencing factors of PM_(2. 5)concentration, and CO was the major contributor to PM_(2. 5)concentration rising in Shenzhen City.