Learn the Issues
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Frequently Asked Questions about Air Emissions Monitoring
Questions often asked about air emissions monitoring and the regulations.
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Frequently Asked Questions Concerning the Compliance Assurance Monitoring Rule
Thirty three questions and responses about the Compliance Assurance Monitoring (CAM) Rule.
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Air Pollution Control Technology Fact Sheet for Permanent Total Enclosures
Permanent Total Enclosures (PTEs) capture device technology fact sheet
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Quantifying Energy Savings and Greenhouse Gas (GHG) Reductions
Quantifying Energy Savings and Greenhouse Gas (GHG) Reductions
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Study Supporting Innovative Air Permits
Reports from a study conducted by EPA supporting innovative air permits including streamlining air monitoring requirements.
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Summary of Monitoring Requirements for Printing and Publishing NSPS and NESHAP
This table summarizes the NSPS and NESHAPS monitoring requirements for the printing and publishing industry.
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CO$T-AIR Control Cost Spreadsheets
Document explains the control cost spreadsheets for calculating control technique capital and annual costs
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Is underground storage included in the definition of a process?
Would underground storage of a regulated substance listed at 40 CFR §68.130 subject a stationary source owner or operator to the risk management program regulations? If more than a threshold quantity of a regulated substance is present in a process at a stationary source, the owner or operator of that…
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Hydrochloric acid and hydrogen chloride listed separately
Why are hydrochloric acid and hydrogen chloride listed separately in the list of regulated substances at 40 CFR §68.130? The aqueous form (hydrochloric acid) and the anhydrous form of this chemical (hydrogen chloride) have been assigned different thresholds.
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Did the Risk Management Program final rule affect the List Rule?
Did the Risk Management Program final rule ( 61 FR 31668 ; June 20, 1996) change or affect the January 31, 1994, List of Regulated Substances and Threshold Quantities final rule (59 FR 4478; January 31, 1994)? No. The Risk Management Program final rule did not alter the 1994 "List…
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Are bulk storage terminals exempt from filing a Risk Management Plan?
There is no general exemption for bulk storage terminals. However, the threshold exemption for "regulated substances in naturally occurring hydrocarbon mixtures prior to entry into a natural gas processing plant or a petroleum refining processing unit" would exempt certain storage terminals, such as crude oil storage terminals where the regulated…
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How did the January 6, 1998, final rule affect the definition of stationary source?
How did the January 6, 1998, final rule ( 63 FR 640 ) affect the definition of stationary source, as it relates to the transportation exemption? The January 6, 1998 final rule amended the regulatory definition of stationary source by removing previous references to "active shipping papers" and "temporary storage"…
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Compliance date for adding covered processes
What happens if I bring a new covered process on line (e.g., install a second storage tank) after submitting my original RMP? For a new covered process added after the initial compliance date, you must be in compliance on the date you first have a regulated substance above the threshold…
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Are methane processes at landfills subject to RMP?
Some landfills collect methane gas and either vent, flare, or store it for subsequent fuel use. Are methane processes at landfills subject to the requirements of the EPA Risk Management Program? In general, methane processes at landfills will not be covered under the Risk Management Program. Methane that is collected…
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Amounts of chlorine present in sodium hypochlorite
Must the amount of chlorine present in sodium hypochlorite be considered when determining whether a process is subject to the Risk Management Program regulations in 40 CFR Part 68? No. The risk management program regulations apply only to processes that contain more than a threshold quantity of one of the…
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Are the risk management program requirements applicable to federal facilities?
Yes. The requirements at 40 CFR Part 68 are applicable to an owner or operator of a stationary source that has more than a threshold quantity of a regulated substance in a process (40 CFR §68.10(a)). The definition of stationary source includes buildings, structures, equipment, installations, or substance emitting stationary…
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Applicability for piping between companies
I operate a single covered process on a site owned by a large company. I manufacture a regulated substance that I pipe to the other company for use in its processes. At what point do the piping and substance become part of the other company’s stationary source? The answer will…
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Are explosives listed regulated substances under CAA 112(r)?
No. Explosives classified by the Department of Transportation as Class 1, Division 1.1 were initially listed as regulated substances with a threshold quantity of 5,000 pounds because of their potential to cause offsite impacts ( 59 FR 4478 ; January 31, 1994). In accordance with a Settlement Agreement between EPA…
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Which chemicals are covered by the general duty provisions?
For CAA section 112(r)(1), General Duty, what are the chemicals that are covered? There is no specific list of substances which subject a stationary source owner or operator to the general duty provisions. The general duty provisions apply to owners and operators of all stationary sources which have any "extremely…
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Are motor fuels exempt from threshold determination?
Are motor fuels (e.g., gasoline and diesel fuel) exempt from threshold determination? EPA provided a specific exemption from threshold determination for regulated flammable substances in gasoline used as fuel for internal combustion engines. This exemption applies solely to gasoline. However, there is a general exemption from threshold determination for regulated…