Environmental Compliance, Waste & Water Management worked example

Air Permit Throughput at 99% control device uptime or capture factor: a worked example

What does the result look like when control device uptime or capture factor reaches 99%? The full calculation is worked below with real intermediate numbers. an environmental or operations manager needs a time-based air permit throughput

The inputs for this scenario

  • Permitted or actual emissions: 18 tons (unchanged)
  • Source operating hours: 4,200 hr (unchanged)
  • Control device uptime or capture factor: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Raw rate = permitted or actual emissions รท source operating hours) to the inputs above produces each figure below.
  • At this operating point the engine returns 0 tons/hr for air permit throughput, the number this scenario is built around.
  • At this operating point the engine returns 0 tons/hr for raw air permit throughput.
  • At this operating point the engine returns 99 % for control uptime or capture factor.
  • At this operating point the engine returns 4,200 hr for source operating hours.

How this compares with the baseline

  • Against the tool's baseline example, where control device uptime or capture factor sits at 95% and the headline result is 0 tons/hr, this scenario comes in 4.21% above the baseline at 0 tons/hr.
  • A figure at this level is achievable when control device uptime or capture factor is genuinely sustained, not just peaked for a shift. It produces a period average and assumes emissions are spread evenly, so it will not catch short high-emission bursts that breach an hourly limit even when the average looks fine.

Results at a glance

  • Air Permit Throughput: 0 tons/hr (headline result)
  • Raw air permit throughput: 0 tons/hr
  • Control uptime or capture factor: 99 %
  • Source operating hours: 4,200 hr

Run it with your numbers

  • Every input above is editable in the live Air Permit Throughput calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.