Quantitative method for judging influence of meteorological and source emission change on air quality

Abstract

The invention discloses a quantitative method for judging the influence of meteorological and source emission changes on air quality, and aims to solve the problem that the existing method cannot judge the improvement effect of meteorological changes and pollution source emission changes on air quality. The method comprises the following specific steps: acquiring a reference source emission list to obtain emission data; simulating emission data of different meteorological conditions by adopting a three-dimensional air quality model, so that the influence of different meteorological conditionson the concentration under the same emission scene is compared, and verifying the estimation result of the model on the meteorological favorable degrees in different periods by using measured data; and determining actual concentration change by using the measured data, and comparing the concentration change rate caused by meteorological condition change with the measured concentration change rateto obtain the concentration change rate caused by source emission change. The contribution of meteorological conditions and emission changes to pollutant concentration changes can be quantified, and the method has important significance in determining pollution causes and making pollution prevention and control plans.

Description

technical field [0001] The invention relates to the field of air pollution prevention and control, in particular to a quantitative method for judging the influence of meteorological and source emission changes on air quality. Background technique [0002] Haze pollution is one of the main atmospheric environmental problems faced by cities and regions in our country at present, showing the characteristics of high frequency of occurrence and large areas of haze. Atmospheric haze is a phenomenon of reduced visibility caused by the extinction of fine particulate matter (PM2.5) under high humidity conditions. It is essentially aerosol fine particle pollution. Fine particles are an important component of atmospheric aerosols, which can be produced in two ways: primary fine particles directly discharged from pollution sources and secondary fine particle aerosols generated by atmospheric chemical reactions from gaseous precursors. The sources of primary particulate matter mainly in...

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Problems solved by technology

[0003] The factors that affect the concentration of PM2.5 mainly include meteorological factors and source emission factors. At present, there have been researches on the composition and sources of PM2.5, but there is no good answer on whether PM2.5 is caused by adverse meteorological conditions or by emission factors. quantitative judgment

The factors that affect the ozone concentration also mainly include meteorological factors and source emission factors, and the relationship between ozone and precursors (NOx and VOCs) is complicated. Reducing the concentration of precursors will sometimes cause an increase in ozone concentration. Currently, there are existing sources of ozone There must be some research, but there is no good method to quantitatively judge whether the change in ozone concentration is caused by adverse meteorological conditions or by emission factors

[0004] For changes in air pollutants, changes in meteorological or climatic conditions are usually used to qualitatively determine the impact of changes in meteorological conditions. For example, changes in meteorological conditions such as a decrease in average wind speed, an increase in the number of small wind days, a decrease in precipitation, and a decrease in the number of precipitation days can be considered as It is the meteorological conditions that are not conducive to the decline of PM2.5 concentration. If the PM2.5 concentration of the year or the current month rises, part of the reason can be attributed to the unfavorable meteorological conditions. , it cannot be analyzed quantitatively, but can only qualitatively describe the impact of changes in meteorological conditions on changes in air quality

Similarly, since the intensity of sunlight will affect the formation of ozone, it is generally believed that increased sunshine is a meteorological condition that is unfavorable to ozone, but factors such as wind direction and wind speed will also have an impact on the ozone concentration of a city or region. It is impossible to analyze qualitatively and quantitatively whether the change or the change of pollutant emissions is dominant.

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