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.
Sample 1Sample 2Sample 3
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.
Sample 1Sample 2Sample 3
PM2.5 Precursor means any chemical compound or substance which,
Sample 1Sample 2Sample 3

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.

  • 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.

  • Products may be finished or semi-finished and are generally made for the wholesale market, transfer to other industrial operations, or for order by businesses or consumers.*The general standards in Sect.

  • 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.

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

  • 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.

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

  • The PM2.5 Precursor Guidance builds upon the draft version of the guidance, released on November 17, 2016 (“Draft PM2.5 Precursor Guidance”), which CARB referenced in developing its precursor demonstration in the SJV PM2.5 Plan.


More Definitions of PM2.5 Precursor

PM2.5 Precursor means any chemical compound or substance which, after it has been
Sample 1
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.”
Sample 1

Related to PM2.5 Precursor

  • Precursor means any chemical reactant which takes part at any stage in the production by whatever method of a toxic chemical. This includes any key component of a binary or multicomponent chemical system.

  • Cannabinoid extract means a substance obtained by separating cannabinoids from marijuana by:

  • Grab sample means an individual sample collected in less than 15 minutes in conjunction with an instantaneous flow measurement.

  • nanomaterial means a natural, incidental or manufactured material containing particles in an unbound state or as an aggregate or as an agglomerate and where, for 50 % or more of the particles in the number size distribution, one or more external dimensions is in the size range 1-100 nm;

  • HEPA filter means a high efficiency particulate absolute air filter capable of trapping and retaining 99.97 percent of fibers greater than 0.3 micrometers in mass median aerodynamic diameter equivalent.

  • Prosthesis means an artificial substitute for a missing body part.

  • Vaccine means a specially prepared antigen which, upon administration to a person, will result in immunity and, specifically for the purposes of this rule, shall mean influenza and pneumococcal vaccines.

  • Cannabinoid edible means food or potable liquid into which a cannabinoid concentrate, cannabinoid extract or dried marijuana leaves or flowers have been incorporated.

  • Immediate precursor means a substance which the Board of Pharmacy has found to be and by regulation designates as being the principal compound commonly used or produced primarily for use, and which is an immediate chemical intermediary used or likely to be used in the manufacture of a controlled substance, the control of which is necessary to prevent, curtail, or limit manufacture.

  • Membrane filtration means a pressure or vacuum driven separation process in which particulate matter larger than 1 micrometer is rejected by an engineered barrier, primarily through a size-exclusion mechanism, and which has a measurable removal efficiency of a target organism that can be verified through the application of a direct integrity test. This definition includes the common membrane technologies of microfiltration, ultrafiltration, nanofiltration, and reverse osmosis.

  • coronavirus means severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2);

  • Cannabinoid means any of the chemical compounds that are the active constituents of marijuana.

  • Anaerobic digestion ’ means a controlled process involving microbial decomposition of organic matter in the absence of oxygen ;

  • Riprap means small, broken stones or boulders placed compactly or irregularly on dykes or similar embankments for protection of earth surfaces against wave action or current;

  • Tetrahydrocannabinol means the natural or synthetic equivalents of the substances contained in the plant, or in the resinous extractives of, Cannabis sativa, or any synthetic substances, compounds, salts, or derivatives of the plant or chemicals and their isomers with similar chemical structure and pharmacological activity.

  • Field-flattening filter means a filter used to homogenize the absorbed dose rate over the radiation field.

  • Self-contained breathing apparatus or "SCBA" means an atmosphere-supplying respirator for which the breathing air source is designed to be carried by the user.

  • NZOC means the New Zealand Olympic Committee Incorporated.

  • Sewage sludge weight means the weight of sewage sludge, in dry U.S. tons, including admixtures such as liming materials or bulking agents. Monitoring frequencies for sewage sludge parameters are based on the reported sludge weight generated in a calendar year (use the most recent calendar year data when the NPDES permit is up for renewal).

  • Pyrolysis means the thermal degradation of a substance in the absence of any oxidising agent, which does not form part of the substance itself, to produce char and gas and/or liquid; and

  • Diatomaceous earth filtration means a process resulting in substantial particulate removal in which a precoat cake of diatomaceous earth filter media is deposited on a support membrane (septum), and while the water is filtered by passing through the cake on the septum, additional filter media known as body feed is continuously added to the feed water to maintain the permeability of the filter cake.

  • Biological safety cabinet means a containment unit suitable for the preparation of low to moderate risk agents where there is a need for protection of the product, personnel, and environment, according to National Sanitation Foundation (NSF) Standard 49.

  • Animal means any nonhuman animate being endowed with the power of voluntary action.

  • Sludge dryer means any enclosed thermal treatment device that is used to dehydrate sludge and that has a maximum total thermal input, excluding the heating value of the sludge itself, of 2,500 Btu/lb of sludge treated on a wet-weight basis.

  • Total tetrahydrocannabinol means the sum of the percentage by weight of tetrahydrocannabinolic acid multiplied by eight hundred seventy-seven thousandths plus the percentage of weight of tetrahydrocannabinol.

  • COVID-19 symptoms means fever of 100.4 degrees Fahrenheit or higher, chills, cough, shortness of breath or difficulty breathing, fatigue, muscle or body aches, headache, new loss of taste or smell, sore throat, congestion or runny nose, nausea or vomiting, or diarrhea, unless a licensed health care professional determines the person’s symptoms were caused by a known condition other than COVID-19.