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Journal Article Ppublish 20 citations

PubMed: 34567797 DOI: 10.3390/atmos12081044

Predicting the Nonlinear Response of PM 2.5 and Ozone to Precursor Emission Changes with a Response Surface Model.

Atmosphere (Basel) 12(8):1-1044

Authors: James T Kelly, Carey Jang, Yun Zhu, Shicheng Long, Jia Xing, Shuxiao Wang, Benjamin N Murphy, Havala O T Pye

Affiliations

  • Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, Durham, NC 27711, USA.
  • School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China.
  • State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China.
  • Center for Environmental Measurement and Modeling, U.S. Environmental Protection Agency, Research Triangle Park, Durham, NC 27711, USA.

Abstract

Reducing PM 2.5 and ozone concentrations is important to protect human health and the environment. Chemical transport models, such as the Community Multiscale Air Quality (CMAQ) model, are valuable tools for exploring policy options for improving air quality but are computationally expensive. Here, we statistically fit an efficient polynomial function in a response surface model (pf-RSM) to CMAQ simulations over the eastern U.S. for January and July 2016. The pf-RSM predictions were evaluated using out-of-sample CMAQ simulations and used to examine the nonlinear response of air quality to emission changes. Predictions of the pf-RSM are in good agreement with the out-of-sample CMAQ simulations, with some exceptions for cases with anthropogenic emission reductions approaching 100%. NO X emission reductions were more effective for reducing PM 2.5 and ozone concentrations than SO 2, NH 3, or traditional VOC emission reductions. NH 3 emission reductions effectively reduced nitrate concentrations in January but increased secondary organic aerosol (SOA) concentrations in July. More work is needed on SOA formation under conditions of low NH 3 emissions to verify the responses of SOA to NH 3 emission changes predicted here. Overall, the pf-RSM performs well in the eastern U.S., but next-generation RSMs based on deep learning may be needed to meet the computational requirements of typical regulatory applications.

MeSH

Air Pollution

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