Actual Emission Rate

{
  "id": "MLC-T-ENV-000422",
  "term": "Actual Emission Rate",
  "field": "Environment",
  "definition": "1. Emissions of a pollutant from an affected source determined by taking into account actual emission rates associated with normal source operation and actual or representative production rates (i.e., capacity utilization and hours of operation).\n\n2. Actual rate of emissions of a pollutant, but does not include excess emissions from a malfunction, or startups and shutdowns associated with a malfunction. Actual emissions shall be calculated using the early reductions source's actual operating rates, and types of materials processed, stored, or combusted during the selected time period.\n\n3. Actual rate of emissions of a pollutant from an emissions unit as determined in paragraphs (1) - (3) of this definition: (1) In general, actual emissions as of a particular date shall equal the average rate, in tons per year, at which the unit actually emitted the pollutant during a two-year period which precedes the particular date and which is representative of normal source operation. EPA shall allow the use of a different time period upon a determination that it is more representative of normal source operation. Actual emissions shall be calculated using the unit’s actual operating hours, production rates, and types of materials processed, stored, or combusted during the selected time period. (2) EPA may presume that the source-specific allowable emissions for the unit are equivalent to the actual emissions of the unit. (3) For any emissions unit which has not begun normal operations on the particular date, actual emissions shall equal the potential to emit of the unit on that date.\n\n4. Actual rate of emissions, in tons per year, of an air pollutant emitted from an air pollution source. For an existing air pollution source, the actual emissions are the actual rate of emissions for the preceding calendar year and must be calculated using the actual operating hours, production rates, in-place control equipment, and types of materials processed, stored, or combusted during the preceding calendar year. For a new air pollution source that did not operate during the preceding calendar year, the actual emissions are the estimated actual rate of emissions for the current calendar year.\n\n5. Actual rate of emissions of a pollutant, but does not include excess emissions from a malfunction, or startups and shutdowns associated with a malfunction. Actual emissions shall be calculated using the source’s actual operating rates, and types of materials processed, stored, or combusted during the selected time period.",
  "references": [
    "40 CFR 51.491 (CFR 2013)",
    "40 CFR 71.22 (CFR 2013)",
    "40 CFR 49.22 (CFR 2013)",
    "40 CFR 49.123 (CFR 2013)",
    "40 CFR 63.71 (CFR 2018)"
  ],
  "url": "https://mlchart.com/terminology/environment/actual-emission-rate/"
}