---
kind: "section"
citation: "40 C.F.R. § 1066.601"
title: "40"
number: "1066.601"
heading: "Overview."
url: "https://uscodex.org/cfr/40/1066.601"
---

# §1066.601. Overview.

- (a) **This subpart describes calculations used to determine emission rates.** See the standard-setting part and the other provisions of this part to determine which equations apply for your testing. This subpart describes how to—
  - (1) Use the signals recorded before, during, and after an emission test to calculate distance-specific emissions of each regulated pollutant.
  - (2) **Perform calculations for calibrations and performance checks.**
  - (3) **Determine statistical values.**
- (b) You may use data from multiple systems to calculate test results for a single emission test, consistent with good engineering judgment. You may also make multiple measurements from a single batch sample, such as multiple weighing of a PM filter or multiple readings from a bag sample. Although you may use an average of multiple measurements from a single test, you may not use test results from multiple emission tests to report emissions. We allow weighted means where appropriate, such as for sampling onto a PM filter over the FTP. You may discard statistical outliers, but you must report all results.

## Notes

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 79 FR 23823, Apr. 28, 2014, unless otherwise noted.