Overall Solution to Stereoscopic Observation of Combined Air Pollution
In recent years, as air environmental pollution worsens, haze and other pollution weathers have occurred frequently in a wide range and lasted for a long time, thus attracting great attention of the whole society and the state. In the Three-year Action Plan for Protecting Blue Sky issued in July 2018, the State Council required that by 2020, the total emission of sulfur dioxide and nitrogen oxide should decrease by at least 15% respectively, compared with 2015. The concentration of PM2.5 in prefecture-level cities or above failing to reach the standard fell by more than 18%, compared with 2015. The proportion of days with good air quality in prefecture-level cities or above reached 80%, and the proportion of days with severe pollution or above was reduced by more than 25%, compared with 2015.
At present, various prefecture-level cities are in the bottleneck period of pollution control. On the one hand, there is little room for improvement and further improvement of air quality. On the other hand, there is assessment pressure in the last year. The reason for current situation is that, current atmospheric environmental problems in China tend to be compound and diversified, and regional particulate matter and photochemical smog pollution have become the focus and hotspot issues in the field of atmospheric environmental protection. The environmental pollution issue presents the structural, compound and compressible characteristics. Compound air pollution refers to a complex atmospheric pollution system consisting of multiple pollutants from multiple sources interacting and coupling with each other under certain atmospheric conditions (such as temperature, humidity and light, etc.), and the main phenomena include atmospheric visibility reduction, atmospheric oxidation enhancement and environmental degradation spreading to the whole region.
Integrated atmospheric monitoring should be established, including sound particulate monitoring capability: evaluation of particulate matter concentration in the air, dynamic spatial and temporal distribution of particulate matters, physical and chemical properties of particulate matters, chemical constituents of particulate matters, and source analysis of single particulate matter; including ozone photochemical pollution monitoring: evaluation of ozone concentration in the air, dynamic spatial and temporal distribution of ozone, monitoring of substances and concentrations involved in photochemical reactions, and monitoring of precursor and intermediate products in photochemical reaction; including monitoring of factors affecting pollution generation and backward trend: atmospheric stability near the ground surface, space meteorological factor, temperature and humidity structure of the boundary layer, and regional pollution transfer.
The atmospheric monitoring superstation is generally equipped with haze monitoring instruments such as black carbon meter, turbidity meter, atmospheric stability, volatile organic compound, solar photometer, organic carbon, elemental carbon and laser radar, except conventional 6-parameter (AQI) monitoring instrument, with multiple functions of physicochemical properties of atmospheric particulates (aerosol), photochemical reaction, meteorological observation of the boundary layer and haze component analysis.