---
kind: "section"
citation: "40 C.F.R. § 60.1850"
title: "40"
number: "60.1850"
heading: "What records must I keep for continuously monitored pollutants or parameters?"
url: "https://uscodex.org/cfr/40/60.1850"
---

# §60.1850. What records must I keep for continuously monitored pollutants or parameters?


You must keep records of eight items.

- (a) **Records of monitoring data.** Document six parameters measured using continuous monitoring systems:
  - (1) **All 6-minute average levels of opacity.**
  - (2) **All 1-hour average concentrations of sulfur dioxide emissions.**
  - (3) For Class I municipal waste combustion units only, all 1-hour average concentrations of nitrogen oxides emissions.
  - (4) **All 1-hour average concentrations of carbon monoxide emissions.**
  - (5) **All 1-hour average load levels of your municipal waste combustion unit.**
  - (6) **All 1-hour average flue gas temperatures at the inlet of the particulate matter control device.**
- (b) **Records of average concentrations and percent reductions.** Document five parameters:
  - (1) All 24-hour daily block geometric average concentrations of sulfur dioxide emissions or average percent reductions of sulfur dioxide emissions.
  - (2) For Class I municipal waste combustion units only, all 24-hour daily arithmetic average concentrations of nitrogen oxides emissions.
  - (3) All 4-hour block or 24-hour daily block arithmetic average concentrations of carbon monoxide emissions.
  - (4) **All 4-hour block arithmetic average load levels of your municipal waste combustion unit.**
  - (5) All 4-hour block arithmetic average flue gas temperatures at the inlet of the particulate matter control device.
- (c) **Records of exceedances.** Document three items:
  - (1) Calendar dates whenever any of the five pollutant or parameter levels recorded in [paragraph (b)](#b) of this section or the opacity level recorded in [paragraph (a)(1)](#a-1) of this section did not meet the emission limits or operating levels specified in this subpart.
  - (2) **Reasons you exceeded the applicable emission limits or operating levels.**
  - (3) **Corrective actions you took, or are taking, to meet the emission limits or operating levels.**
- (d) **Records of minimum data.** Document three items:
  - (1) Calendar dates for which you did not collect the minimum amount of data required under §§ [60.1750](/cfr/40/60.1750.md) and [60.1825](/cfr/40/60.1825.md). Record those dates for five types of pollutants and parameters:
    - (i) **Sulfur dioxide emissions.**
    - (ii) **For Class I municipal waste combustion units only, nitrogen oxides emissions.**
    - (iii) **Carbon monoxide emissions.**
    - (iv) **Load levels of your municipal waste combustion unit.**
    - (v) **Temperatures of the flue gases at the inlet of the particulate matter control device.**
  - (2) **Reasons you did not collect the minimum data.**
  - (3) **Corrective actions you took or are taking to obtain the required amount of data.**
- (e) **Records of exclusions.** Document each time you have excluded data from your calculation of averages for any of the following five pollutants or parameters and the reasons the data were excluded:
  - (1) **Sulfur dioxide emissions.**
  - (2) **For Class I municipal waste combustion units only, nitrogen oxides emissions.**
  - (3) **Carbon monoxide emissions.**
  - (4) **Load levels of your municipal waste combustion unit.**
  - (5) **Temperatures of the flue gases at the inlet of the particulate matter control device.**
- (f) **Records of drift and accuracy.** Document the results of your daily drift tests and quarterly accuracy determinations according to Procedure 1 of appendix F of this part. Keep those records for the sulfur dioxide, nitrogen oxides (Class I municipal waste combustion units only), and carbon monoxide continuous emissions monitoring systems.
- (g) **Records of the relationship between oxygen and carbon dioxide.** If you choose to monitor carbon dioxide instead of oxygen as a diluent gas, document the relationship between oxygen and carbon dioxide, as specified in [§ 60.1745](/cfr/40/60.1745.md).
- (h) **Records of calendar dates.** Include the calendar date on each record.

## Notes

### Source

Source: 65 FR 76384, 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.