NSPS Notebook
Appendix A-4: Test Methods 6 through 10B -  Subpart Appendix A-4

Applicability: eCFR Appendix A-4 [ecfr.gov]

Test methods for stationary sources:
Method 6:
Determination of SO2 emissions

Method 6A:
Determination of SO2, moisture, and CO2 from fossil fuel combustion sources.

Method 6B:
Determination of SO2 and CO2 daily average emission from fossil fuel combustion sources.

Method 6C:
Determination of SO2 emissions (instrumental analyzer procedure).

Method 7:
Determination of NOx emissions

Method 7A:
Determination of NOx emissions (ion chromatographic method).

Method 7B:
Determination of NOx emissions (ultraviolet spectrophotometry).

Method 7C:
Determination of NOx emissions (alkaline-permanganate/ colorimetric method)

Method 7D:
Determination of NOx emissions (alkaline-permangante/ion chromatographic method)

Method 7E:
Determination of NOx emissions (instrumental analyzer procedure).

Method 8:
Determination of sulfuric acid (H2SO4) mist and SO2 emissions

Method 9:
Visual determination of the opacity of emissions

Alternate Method 1 to Method 9:
Determination of opacity remotely by lidar.

Method 10:
Determination of CO emissions

Method 10A:
Determination of CO emissions in certifying continuous emission monitoring systems (CEMS) at petroleum refineries.

Method 10B:
Determination of CO emissions
Known Sources in NDEE Jurisdiction:
Date of Original Final Rule: 12/23/71
Amendments Dates: 09/13/2010 (75 FR 55647)
10/17/2000 (65 FR 61744)
State Regulations: Title 129, Chapter 12, Section 001.86

Prevoiusly: Chapter 18, Section 001.64
Federal Regulations: 40 CFR 60 Appendix A-4
Related Rules:
Regulations and Federal Registers: eCFR Appendix A-4 [ecfr.gov]
FAQs, Fact Sheets, and Rule Summaries:
Other Information and Resources:
Page Last Updated: 12/30/22