4-Hour Block Average Emission Rate

{
  "id": "MLC-T-ENV-000073",
  "term": "4-Hour Block Average Emission Rate",
  "field": "Environment",
  "definition": "1. Average of all hourly emission rates when the affected facility is operating and combusting MSW measured over 4-hour periods of time from 12 midnight to 4 a.m., 4 a.m. to 8 a.m., 8 a.m. to 12 noon, 12 noon to 4 p.m., 4 p.m. to 8 p.m., and 8 p.m. to 12 midnight.\n\n2. Average of all hourly emission concentrations when the affected facility is operating and combusting municipal solid waste measured over 4-hour periods of time from 12:00 midnight to 4 a.m., 4 a.m. to 8 a.m., 8 a.m. to 12:00 noon, 12:00 noon to 4 p.m., 4 p.m. to 8 p.m., and 8 p.m. to 12:00 midnight.\n\n3. Average of all hourly emission concentrations or parameter levels when the municipal waste combustion unit operates and combusts municipal solid waste measured over any of six 4-hour periods: (1) 12 midnight to 4 a.m. (2) 4 a.m. to 8 a.m. (3) 8 a.m. to 12 noon. (4) 12 noon to 4 p.m. (5) 4 p.m. to 8 p.m. (6) 8 p.m. to 12 midnight.",
  "subject": "Regulatory activities",
  "references": [
    "40 CFR 60.51a (CFR 2013)",
    "40 CFR 60.51b (CFR 2013)",
    "40 CFR 62.15410 (CFR 2018)"
  ],
  "url": "https://mlchart.com/terminology/environment/4-hour-block-average-emission-rate/"
}