Assembly Bill 617, approved in 2017, requires the establishment of a uniform system of reporting criteria and toxic emissions. To achieve this mandate, the California Air Resources Board (CARB) approved the Criteria Pollutants and Toxic Air Contaminants Reporting regulation (CTR). The CTR requires major sources of air pollution, sources designated as high priority under the AB 2588 program and large greenhouse gas emitters to annually report their criteria and toxic emissions.
Details about the CTR are available on CARB's website (LINK).