Secondary PM2.5 definition

Secondary PM2.5 means particles that form or grow in mass through chemical reactions in the ambient air well after dilution and condensation have occurred. Secondary PM2.5 is usually formed at some distance downwind from the source.
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Secondary PM2.5 means particles that form or grow in mass
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Secondary PM2.5 means particles that form or grow in mass through chemical reactions
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Examples of Secondary PM2.5 in a sentence

  • Estimating Ozone and Secondary PM2.5 Impacts from Hypothetical Single Source Emissions in the Central and Eastern United States.

  • Secondary PM2.5 formation occurs as a result of chemical transformations that occur in the atmosphere gradually over time and only a portion of the NOx emissions would be affected.

  • EPA Recommended Approaches for Assessing Primary and Secondary PM2.5 Impacts by Assessment Case Assessment Case Description of Assessment Case A modeled NAAQS compliance demonstration is not required for Case 1 since neither direct PM2.5 emissions nor PM2.5 precursor (NOx and/or SO2) emissions are equal to or greater than the respective SERs. Case 1 is the only assessment case that does not require a modeled NAAQS compliance demonstration.

  • III.2 Assessing Secondary PM2.5 Impacts‌ This section provides more detail on the recommended approaches for assessing the impacts of precursor emissions on secondary PM2.5 formation for Cases 3 and 4 presented in Table III-1 including:• a qualitative assessment; • a hybrid of qualitative and quantitative assessments utilizing existing technical work; and • a full quantitative photochemical grid modeling exercise.

  • A written reprimand, and subsequent reprimands, will be prepared, delivered and discussed with the employee.

  • NOx as a Precursor To Secondary PM2.5 Formation Issue IV.D.1. – BACT for NOx as a Precursor to Secondary Particulate Matter Formation:The Air District has also further reviewed the issue of whether NOx emissions need to be subject to BACT review and permit limits as a precursor to secondary particulate matter formation.

  • If a Tier 2 O3 or Secondary PM2.5 assessment is necessary, a more refined case-specific air quality analysis may be required following consultation with DEQ, with reference to Guidance on the Use of Models for Assessing the Impacts of Emissions from Single Sources on the Secondarily Formed Pollutants: O3 and PM2.5 (EPA-454/R-16-005) (EPA 2016b) (https://www.epa.gov/sites/default/files/2019-02/documents/singlesources2016.pdf).

  • The exploitation activities are detailed as follow.… Exploitation PlanDLR is the German National Aeronautics and Space Administration.

  • Secondary PM2.5 are particles produced from chemicals reactions in the atmosphere and include mainly SO2, NOx, and NH3.

  • The current EPA Tier 1 method for estimating Ozone (O3) and Secondary PM2.5 impacts from industrial facilities is the application of MERPs, which incorporates the results of photochemical grid modeling of hypothetical sources across the country.

Related to Secondary PM2.5

  • Secondary school means a nonprofit institutional day or residential school including a public secondary charter school that provides secondary education for grades 9-12.

  • Secondary emissions means emissions which occur as a result of the construction or operation of a major stationary source or major modification, but do not come from the major stationary source or major modification itself. For the purposes of this chapter, “secondary emissions” must be specific, well-defined, and quantifiable, and must impact the same general areas as the stationary source modification which causes the secondary emissions. “Secondary emissions” includes emissions from any offsite support facility which would not be constructed or increase its emissions except as a result of the construction or operation of the major stationary source or major modification. “Secondary emissions” does not include any emissions which come directly from a mobile source, such as emissions from the tailpipe of a motor vehicle, from a train, or from a vessel.

  • secondary processing means concentration or other beneficiation of iron ore other than by crushing or screening and includes thermal electrostatic magnetic and gravity processing and agglomeration, pelletization or comparable changes in the physical character of iron ore;

  • Secondary Market refers to a bulletin board platform at wxx.xxxxxxxxxxx.xx created by Masterworks.