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Emission Reporting

Sac Metro Air District's permitted sources are required to report emission information for various state and local purposes.  The emission information helps state and local air agencies understand the type and quantity of pollution emitted. Information collected helps us protect the public from unhealthy air and obtain air quality goals. The different reporting requirements that permitted sources must follow are listed below.

​Quarterly or Annual Emission Reports for Permit Holders

​Larger permitted sources and certain source types are required to report emissions of criteria pollutants and toxic pollutants that are regulated by their permit to Sac Metro Air District quarterly or annually depending on their permit conditions.

Sources that are required to submit quarterly or annual emission reports include the following:

  • Sources with a Title V Operating Permit

  • Synthetic Minor Sources 

  • Soil Vapor Extraction Systems

​Point Sources Annual Emission Reporting

Permitted sources that emit 10 tons per year (TPY) or greater of any one criteria pollutant (Stationary Point Sources) are required to submit their annual emissions or data needed to calculate their emissions on a survey form provided by the District.  The annual emissions from each Stationary Point Source are reported individually to the State and then transmitted to EPA.

Permitted sources that emit below 10 TPY (Aggregate Point Sources) are surveyed approximately every 3 years.  Their combined emissions are reported to the State as Area Source categories. 

Assembly Bill 2588 (AB 2588) is a program that helps to determine the risk from air toxic emissions: 

  •  Permitted sources that emit 10 TPY or greater of total organic gases, particulate matter, nitrogen oxides, or sulfur oxides are considered Core Facilities and must submit an emission inventory plan and emission inventory report to determine whether a health risk assessment must be conducted and further risk reduction is needed; or
  • Permitted sources that emit less than 10 TPY of criteria pollutants and are one of several industries known to emit toxics (e.g., retail gas stations, dry cleaners, chrome platers, and diesel internal combustion engines) are considered Industrywide Facilities. They must submit throughput and/or other operational data to the Sac Metro Air District when requested to do so. The information is used to prepare an industrywide emissions inventory and health risk assessments.

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.

The regulation is being amended to include additional sources. The amended regulation will be considered by the CARB Board on November 19, 2020.  

Details about the existing regulation and proposed changes are here (LINK) or on CARB's website (LINK).

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