A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The nonlinear response of fine particulate matter pollution to ammonia emission reductions in North China
Recent Chinese air pollution actions have significantly lowered the levels of fine particulate matter (PM _2.5 ) in North China via controlling emissions of sulfur dioxide (SO _2 ) and nitrogen oxides (NO _x ) together with primary aerosols, while the emissions of another precursor, ammonia (NH _3 ), have not yet been regulated. This raises a question that how effective the NH _3 emission controls can be on the mitigation of PM _2.5 pollution along with the reduction of SO _2 and NO _x emissions. Here we use a regional air quality model to investigate this issue focusing on the PM _2.5 pollution in North China for January and July 2015. We find that the efficiency of the PM _2.5 reduction is highly sensitive to the NH _3 emission and its reduction intensity. Reductions in the population-weighted PM _2.5 concentration (PWC) in the Beijing–Tianjin–Hebei region are only 1.4–3.8 μ g m ^−3 (1.1%–2.9% of PM _2.5 ) with 20%–40% NH _3 emission reductions, but could reach 8.1–26.7 μ g m ^−3 (6.2%–21%) with 60%–100% NH _3 emission reductions in January 2015. Besides, the 2015–2017 emission changes (mainly reduction in SO _2 emissions) could lower the PM _2.5 control efficiency driven by the NH _3 reduction by up to 30% for high NH _3 emission conditions, while lead to no change or increase in the efficiency when NH _3 emissions become low. NO _x emission reductions may enhance the wintertime PM _2.5 pollution due to the weakened titration effect and can be offset by simultaneously controlling NH _3 emissions. Our results emphasize the need to jointly consider NH _3 with SO _2 and NO _x emission controls when designing PM _2.5 pollution mitigation strategies.
The nonlinear response of fine particulate matter pollution to ammonia emission reductions in North China
Recent Chinese air pollution actions have significantly lowered the levels of fine particulate matter (PM _2.5 ) in North China via controlling emissions of sulfur dioxide (SO _2 ) and nitrogen oxides (NO _x ) together with primary aerosols, while the emissions of another precursor, ammonia (NH _3 ), have not yet been regulated. This raises a question that how effective the NH _3 emission controls can be on the mitigation of PM _2.5 pollution along with the reduction of SO _2 and NO _x emissions. Here we use a regional air quality model to investigate this issue focusing on the PM _2.5 pollution in North China for January and July 2015. We find that the efficiency of the PM _2.5 reduction is highly sensitive to the NH _3 emission and its reduction intensity. Reductions in the population-weighted PM _2.5 concentration (PWC) in the Beijing–Tianjin–Hebei region are only 1.4–3.8 μ g m ^−3 (1.1%–2.9% of PM _2.5 ) with 20%–40% NH _3 emission reductions, but could reach 8.1–26.7 μ g m ^−3 (6.2%–21%) with 60%–100% NH _3 emission reductions in January 2015. Besides, the 2015–2017 emission changes (mainly reduction in SO _2 emissions) could lower the PM _2.5 control efficiency driven by the NH _3 reduction by up to 30% for high NH _3 emission conditions, while lead to no change or increase in the efficiency when NH _3 emissions become low. NO _x emission reductions may enhance the wintertime PM _2.5 pollution due to the weakened titration effect and can be offset by simultaneously controlling NH _3 emissions. Our results emphasize the need to jointly consider NH _3 with SO _2 and NO _x emission controls when designing PM _2.5 pollution mitigation strategies.
The nonlinear response of fine particulate matter pollution to ammonia emission reductions in North China
Zehui Liu (author) / Mi Zhou (author) / Youfan Chen (author) / Dan Chen (author) / Yuepeng Pan (author) / Tao Song (author) / Dongsheng Ji (author) / Qi Chen (author) / Lin Zhang (author)
2021
Article (Journal)
Electronic Resource
Unknown
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