---
kind: "section"
citation: "40 C.F.R. § 60.1265"
title: "40"
number: "60.1265"
heading: "How do I convert my 1-hour arithmetic averages into the appropriate averaging times and units?"
url: "https://uscodex.org/cfr/40/60.1265"
---

# §60.1265. How do I convert my 1-hour arithmetic averages into the appropriate averaging times and units?

- (a) Use the equation in [§ 60.1460(a)](/cfr/40/60.1460.md?p=a) to calculate emissions at 7 percent oxygen.
- (b) Use EPA Reference Method 19 in appendix A of this part, [section 4.3](/cfr/40/4.3.md), to calculate the daily geometric average concentrations of sulfur dioxide emissions. If you are monitoring the percent reduction of sulfur dioxide, use EPA Reference Method 19 in appendix A of this part, [section 5.4](/cfr/40/5.4.md), to determine the daily geometric average percent reduction of potential sulfur dioxide emissions.
- (c) If you operate a Class I municipal waste combustion unit, use EPA Reference Method 19 in appendix A of this part, [section 4.1](/cfr/40/4.1.md), to calculate the daily arithmetic average for concentrations of nitrogen oxides.
- (d) Use EPA Reference Method 19 in appendix A of this part, [section 4.1](/cfr/40/4.1.md), to calculate the 4-hour or 24-hour daily block averages (as applicable) for concentrations of carbon monoxide.

## Notes

### Source

Source: 65 FR 76355, Dec. 6, 2000, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 36 FR 24877, Dec. 23, 1971, unless otherwise noted.