PM2.5 Precursor definition

PM2.5 Precursor means any chemical compound or substance which, after it has been emitted into the atmosphere, undergoes chemical or physical changes that convert it into particulate matter, specifically PM2.5, and has been identified in the applicable implementation plan for PM2.5 as significant for the purpose of developing control measures. Specifically, PM2.5 precursors include SO2, NOx, and VOC.
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PM2.5 Precursor means any chemical compound or substance
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PM2.5 Precursor means any chemical compound or substance which, after it has been emitted into the atmosphere, undergoes chemical or physical changes that convert it into particulate matter, specifically PM2.5.
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Examples of PM2.5 Precursor in a sentence

  • Evaluating the Contribution of PM2.5 Precursor Gases and Re-entrained Road Emissions to Mobile Source PM2.5 Particulate Matter Emissions.

  • Monetized Health Co-Benefits Per Ton of PM2.5 Precursor Reductions in2020 (in 2011$) 5-43Table 5-13.

  • Both of these contribution estimates are well under the recommended insignificance threshold of 1.3 mg/m3 contained in EPA’s draft PM2.5 Precursor Demonstration Guidance.4Based on the information provided in the District’s submitted analysis, EPA is proposing to approve the District’s demonstration that SO2 emissions from new and modified major SO2 sources will not contribute significantly to 24- hour PM2.5 concentrations exceeding the standard in the area.

  • Public Health Costs of Primary PM2.5 and Inorganic PM2.5 Precursor Emissions in the United States.

  • EPA’s PM2.5 Precursor Guidance5 indicates that SOA remains the least understood component of PM2.5 and continues to be a significant topic of research and investigation.

  • The PM2.5 Precursor Guidance explains that in cases where the PM2.5 response to a 30 percent reduction in precursor emissions is close to the contribution threshold, the EPA may require air agencies to identify and evaluate potential emissions controls in support of a precursor demonstration that relies on a sensitivity analysis.

  • The USEPA November 17, 2016 Memo titled Draft PM2.5 Precursor Demonstration Guidance requires that sulfur dioxide (SO2), oxides of nitrogen (NOx), VOC, and ammonia must be evaluated in the development of all PM2.5 nonattainment area State Implementation Plans.

  • Rich Damberg, EPA Office of Air Quality Planning and Standards, Policies for Addressing PM2.5 Precursor Emissions (June 20, 2007) at Slide 8.

  • Ammonia as a PM2.5 Precursor Ammonia reacts with other pollutants to produce particulate matter.

  • Gao, “Public Health Costs of Primary PM2.5 and Inorganic PM2.5 Precursor Emissions in the United States,” Environmental Science & Technology, 50 (11), 6061–6070, 2016, available at: https://www.sciencedirect.com/science/article/pii/S0160412017303586?via%3Dihub; EASIUR Online Tool available at: https://barney.ce.cmu.edu/~jinhyok/easiur/.


More Definitions of PM2.5 Precursor

PM2.5 Precursor means any chemical compound or substance which, after it has been
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PM2.5 Precursor means those air pollutants other than PM2.5 direct emissions that significantly contribute to the formation of PM2.5 in a specific area. PM2.5 precursors include sulfur dioxide, nitrogen oxides, VOC and ammonia except the director may exempt a particular precursor from the requirements of this chapter if a demonstration of insignificant contribution is approved by the administrator of the USEPA. In Ohio, the precursors VOC and ammonia are determined to be insignificant contributors to the formation of PM2.5. In the event the administrator of the USEPA has not approved Ohio’s demonstration by the effective date of this rule, the determination of VOC or ammonia as a precursor for PM2.5 shall be made
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PM2.5 Precursor means those air pollutants other than PM2.5 direct emissions that significantly contribute to the formation of PM2.5 in a specific
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PM2.5 Precursor means those air pollutants other than PM2.5 direct emissions that Ohio EPA has demonstrated, with US EPA approval, significantly contribute to the formation of PM2.5 in a specific area. PM2.5 precursors include sulfur dioxide and nitrogen oxides.”
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