40 CFR Part 53, Table B-3
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Pollutant | Analyzer type 2 | Hydro-chloric acid | Ammonia | Hydrogen sulfide | Sulfur dioxide | Nitrogen dioxide | Nitric oxide | Carbon dioxide | Ethylene | Ozone | M-xylene | Water vapor | Carbon monoxide | Methane | Ethane | Naphthalene |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SO2 | Ultraviolet fluorescence | | | 5 0.1 | 4 0.14 | 0.5 | 0.5 | | | 0.5 | 0.2 | 20,000 | | | | 6 0.05 | ||||
| SO2 | Flame photometric | | | 0.01 | 4 0.14 | | | 750 | | | | 3 20,000 | 50 | |||||||
| SO2 | Gas chromatography | | | 0.1 | 4 0.14 | | | 750 | | | | 3 20,000 | 50 | |||||||
| SO2 | Spectrophotometric-wet chemical (pararosanaline) | 0.2 | 0.1 | 0.1 | 4 0.14 | 0.5 | | 750 | | 0.5 | ||||||||
| SO2 | Electrochemical | 0.2 | 0.1 | 0.1 | 4 0.14 | 0.5 | 0.5 | | 0.2 | 0.5 | | 3 20,000 | ||||||
| SO2 | Conductivity | 0.2 | 0.1 | | 4 0.14 | 0.5 | | 750 | ||||||||||
| SO2 | Spectrophotometric-gas phase, including DOAS | | | | 4 0.14 | 0.5 | 0.5 | | | 0.5 | 0.2 | ||||||||
| O3 | Ethylene Chemiluminescence | | | 3 0.1 | | | | 750 | | 4 0.08 | | 3 20,000 | |||||||||
| O3 | NO-chemiluminescence | | | 3 0.1 | | 0.5 | | 750 | | 4 0.08 | | 3 20,000 | |||||||||
| O3 | Electrochemical | | 3 0.1 | | 0.5 | 0.5 | | | | 4 0.08 | | 3 20,000 | |||||||||
| O3 | Spectrophotometric-wet chemical (potassium iodide) | | 3 0.1 | | 0.5 | 0.5 | 3 0.5 | | | 4 0.08 | |||||||||
| O3 | Spectrophotometric-gas phase, including ultraviolet absorption and DOAS | | | | 0.5 | 0.5 | 3 0.5 | | | 4 0.08 | 0.02 | 20,000 | |||||||
| CO | Non-dispersive Infrared | | | | | | | 750 | | | | 20,000 | 4 10 | ||||||||
| CO | Gas chromatography with flame ionization detector | | | | | | | | | | | 20,000 | 4 10 | | 0.5 | |||||||
| CO | Electrochemical | | | | | | 0.5 | | 0.2 | | | 20,000 | 4 10 | ||||||||
| CO | Catalytic combustion-thermal detection | | 0.1 | | | | | 750 | 0.2 | | | 20,000 | 4 10 | 5 | 0.5 | |||||
| CO | IR fluorescence | | | | | | | 750 | | | | 20,000 | 4 10 | | 0.5 | |||||||
| CO | Mercury replacement-UV photometric | | | | | | | | 0.2 | | | | 4 10 | | 0.5 | ||||||||
| NO2 | Chemiluminescent | | 3 0.1 | | 0.5 | 4 0.1 | 0.5 | | | | | 20,000 | ||||||||
| NO2 | Spectrophotometric-wet chemical (azo-dye reaction) | | | | 0.5 | 4 0.1 | 0.5 | 750 | | 0.5 | |||||||||
| NO2 | Electrochemical | 0.2 | 3 0.1 | | 0.5 | 4 0.1 | 0.5 | 750 | | 0.5 | | 20,000 | 50 | ||||||
| NO2 | Spectrophotometric-gas phase | | 3 0.1 | | 0.5 | 4 0.1 | 0.5 | | | 0.5 | | 20,000 | 50 |
1 Concentrations of interferent listed must be prepared and controlled to ±10 percent of the stated value.
2 Analyzer types not listed will be considered by the Administrator as special cases.
3 Do not mix interferent with the pollutant.
4 Concentration of pollutant used for test. These pollutant concentrations must be prepared to ±10 percent of the stated value.
5 If candidate method utilizes an elevated-temperature scrubber for removal of aromatic hydrocarbons, perform this interference test.
6 If naphthalene test concentration cannot be accurately quantified, remove the scrubber, use a test concentration that causes a full-scale response, reattach the scrubber, and evaluate response for interference.
[89 FR 16383, Mar. 6, 2024]