---
kind: "section"
citation: "40 C.F.R. § 62.15210"
title: "40"
number: "62.15210"
heading: "How do I convert my 1-hour arithmetic averages into appropriate averaging times and units?"
url: "https://uscodex.org/cfr/40/62.15210"
---

# §62.15210. How do I convert my 1-hour arithmetic averages into appropriate averaging times and units?

- (a) Use the equation in [§ 62.15390(a)](/cfr/40/62.15390.md?p=a) to calculate emissions at 7 percent oxygen.
- (b) Use EPA Reference Method 19 in appendix A of [40 CFR part 60](/cfr/40/part60.md), [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, [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, [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, [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: 68 FR 5158, Jan. 31, 2003, unless otherwise noted.

### Authority

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

### Source

Source: 43 FR 51393, Nov. 3, 1978, unless otherwise noted.