---
kind: "section"
citation: "40 C.F.R. § 53.2"
title: "40"
number: "53.2"
heading: "General requirements for a reference method determination."
url: "https://uscodex.org/cfr/40/53.2"
---

# §53.2. General requirements for a reference method determination.


The following general requirements for a Federal reference method (FRM) determination are summarized in table A-1 of this subpart.

- (a) **Manual methods—**
  - (1) **Sulfur dioxide (SO—** 2) and Lead. For measuring SO2 and lead, appendixes A-2 and G of [part 50](/cfr/40/part50.md) of this chapter specify unique manual FRM for measuring those pollutants. Except as provided in [§ 53.16](/cfr/40/53.16.md), other manual methods for lead will not be considered for a reference method determination under this part.
  - (2) **PM—** 10. A FRM for measuring PM 10 must be a manual method that meets all requirements specified in appendix J of [part 50](/cfr/40/part50.md) of this chapter and must include a PM 10 sampler that has been shown in accordance with this part to meet all requirements specified in this subpart A and [subpart D](/cfr/40/subpartD.md) of this part.
  - (3) **PM—** 2.5. A FRM for measuring PM 2.5 must be a manual method that meets all requirements specified in appendix L of [part 50](/cfr/40/part50.md) of this chapter and must include a PM 2.5 sampler that has been shown in accordance with this part to meet the applicable requirements specified in this subpart A and [subpart E](/cfr/40/subpartE.md) of this part. Further, FRM samplers must be manufactured in an ISO 9001-registered facility, as defined in [§ 53.1](/cfr/40/53.1.md) and as set forth in [§ 53.51](/cfr/40/53.51.md).
  - (4) **PM—** 10-2.5. A FRM for measuring PM 10-2.5 must be a manual method that meets all requirements specified in appendix O of [part 50](/cfr/40/part50.md) of this chapter and must include PM 10C and PM 2.5 samplers that have been shown in accordance with this part to meet the applicable requirements specified in this subpart A and [subpart E](/cfr/40/subpartE.md) of this part. Further, PM 10-2.5 FRM samplers must be manufactured in an ISO 9001-registered facility, as defined in [§ 53.1](/cfr/40/53.1.md) and as set forth in [§ 53.51](/cfr/40/53.51.md).
- (b) **Automated methods.** An automated FRM for measuring SO2, CO, O3, or NO2 must utilize the measurement principle and calibration procedure specified in the appropriate appendix to [part 50](/cfr/40/part50.md) of this chapter (appendix A-1 only for SO2 methods) and must have been shown in accordance with this part to meet the requirements specified in this subpart A and [subpart B](/cfr/40/subpartB.md) of this part.

## Notes

### Amendments

[71 FR 61271, Oct. 17, 2006, as amended at 75 FR 35597, June 22, 2010]

### Source

Source: 62 FR 38784, July 18, 1997, unless otherwise noted.

### Authority

Authority: Sec. 301(a) of the Clean Air Act (42 U.S.C. sec. 1857g(a)), as amended by sec. 15(c)(2) of Pub. L. 91-604, 84 Stat. 1713, unless otherwise noted.

### Source

Source: 40 FR 7049, Feb. 18, 1975, unless otherwise noted.

### Amendments

[71 FR 61271, Oct. 17, 2006, as amended at 75 FR 35597, June 22, 2010]