---
kind: "section"
citation: "40 C.F.R. § 1066.820"
title: "40"
number: "1066.820"
heading: "Composite calculations for FTP exhaust emissions."
url: "https://uscodex.org/cfr/40/1066.820"
---

# §1066.820. Composite calculations for FTP exhaust emissions.

- (a) Determine the mass of exhaust emissions of each pollutant for each FTP test interval as described in [§ 1066.605](/cfr/40/1066.605.md).
- (b) Calculate the final composite gaseous test results as a mass-weighted value, e[emission]-FTPcomp, in grams per mile using the following equation:
- (c) Calculate the final composite PM test results as a mass-weighted value, ePM-FTPcomp, in grams per mile as follows:
  - (1) Use the following equation for PM measured as described in § [1066.815(b)(1)](/cfr/40/1066.815.md?p=b-1), [(2)](/cfr/40/1066.815.md?p=b-2), or [(3)](/cfr/40/1066.815.md?p=b-3):
  - (2) Use the following equation for PM measured as described in [§ 1066.815(b)(4)](/cfr/40/1066.815.md?p=b-4):
  - (3) Use the following equation for PM measured as described in [§ 1066.815(b)(5)](/cfr/40/1066.815.md?p=b-5):

## Notes

### Amendments

[79 FR 23823, Apr. 28, 2016, as amended at 81 FR 74214, Oct. 25, 2016]

### Authority

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

### Source

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

### Amendments

[79 FR 23823, Apr. 28, 2016, as amended at 81 FR 74214, Oct. 25, 2016]