Increase in Haze Pollutions in China due to Nocturnal Emissions
Author(s): YAN Shao-min, WU Guang, Guangxi Bioscience and Biotechnology Research Center, Guangxi Academy of Sciences
Pages: 675-680
Year: 2015 Issue: 6
Journal: Guangxi Sciences
Keyword: pollution emissions; haze; PM2.5; inverse temperature; emission reduction;
Abstract: Emissions from traffic,industrial combustion,heating and biomass burning are important sources for the formation of haze,of which fine particulate matter is particularly harmful to human health.Regionally,PM2.5,PM10,CO and SO2 concentrations are generally higher in northern China than in western,southeast and southern China because of large PM emissions and unfavorable meteorological conditions for pollution dispersion.Seasonally high pollutions are often visible in winter in most parts of China.Daily,PM2.5is frequently higher during nighttime than during daytime.The increase in PM2.5in nighttime can be attributed to heavy vehicles such as diesel trucks,evening recreation activities such as barbecues,and illegal rubbishburning.Of various factors promoting the formation of haze,stagnant airflow is very important because it makes the dispersal of aerosols difficult.This is crucial for the nighttime because the ground temperature decreases during the nighttime and air turbulence decreases leading to very little vertical air motion.Such meteorological conditions had led to Lake Nyos and Bhopal disasters in history.In this study,we hypothesized that nocturnal emissions increase the haze pollutions in China,and analyzed the meteorological data on hourly surface temperature from Beijing 54511 Observation Station in 2014.The results show that the surface temperaturewas lower at nighttime than at daytime.Therefore,reduction of emission at nighttime could be a cost-effective way to lessen haze pollution at the present stage.
Pages: 675-680
Year: 2015 Issue: 6
Journal: Guangxi Sciences
Keyword: pollution emissions; haze; PM2.5; inverse temperature; emission reduction;
Abstract: Emissions from traffic,industrial combustion,heating and biomass burning are important sources for the formation of haze,of which fine particulate matter is particularly harmful to human health.Regionally,PM2.5,PM10,CO and SO2 concentrations are generally higher in northern China than in western,southeast and southern China because of large PM emissions and unfavorable meteorological conditions for pollution dispersion.Seasonally high pollutions are often visible in winter in most parts of China.Daily,PM2.5is frequently higher during nighttime than during daytime.The increase in PM2.5in nighttime can be attributed to heavy vehicles such as diesel trucks,evening recreation activities such as barbecues,and illegal rubbishburning.Of various factors promoting the formation of haze,stagnant airflow is very important because it makes the dispersal of aerosols difficult.This is crucial for the nighttime because the ground temperature decreases during the nighttime and air turbulence decreases leading to very little vertical air motion.Such meteorological conditions had led to Lake Nyos and Bhopal disasters in history.In this study,we hypothesized that nocturnal emissions increase the haze pollutions in China,and analyzed the meteorological data on hourly surface temperature from Beijing 54511 Observation Station in 2014.The results show that the surface temperaturewas lower at nighttime than at daytime.Therefore,reduction of emission at nighttime could be a cost-effective way to lessen haze pollution at the present stage.
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