Approved Instrument Monitoring Method for oil and gas

Oil and gas facilities must use approved emissions monitoring methods for Leak Detection and Repair (LDAR) and Storage Tank Emission Management (STEM) requirements.
An Approved Instrument Monitoring Method (AIMM) must be used for monitoring storage tanks and components at well production facilities and natural gas compressor stations. An AIMM can be an infrared camera designed for and capable of detecting hydrocarbon and VOC emissions (examples include the FLIR GF300/320 cameras and the OPGAL EyeCGas camera), EPA Reference Method 21, or other instrument-based monitoring device or method approved by us.
Any AIMM we approve must be capable of detecting leaks as defined in Section XVII.F.6 (Air Quality Control Commission Regulation 7, Section XVII.A.2). The AIMM must be capable of measuring hydrocarbon compounds at the applicable leak definition concentration specified in Regulation 7, and calibrated as appropriate (see EPA Method 21, Section 6.0, and AQCC Regulation 7, §XVII.F.6).
While Regulation 7 identifies EPA Method 21 and the infrared camera for leak detection, we don't limit leak detection to those methods. We may approve the use of additional monitoring devices and methods.
For facilities subject to Title V Operating Permit requirements, AIMMs we approve (other than infrared camera or EPA Method 21) must be documented within your Title V Operating Permit if you wish to use them. Please submit a complete Title V modification application or revise your previously submitted application before implementation.
For more information on AIMM and the application process, please see:
Approval letters

More information
Please direct all questions and/or applications to