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 Code of Federal Regulations (Last Updated: November 8, 2024)
 Title 40 - Protection of Environment
 Chapter I—Environmental Protection Agency
 SubChapter C—Air Programs
 Part 63 - National Emission Standards for Hazardous Air Pollutants for Source Categories
 Subpart O - Ethylene Oxide Emissions Standards for Sterilization Facilities

  Table 5 to Subpart O of Part 63 - —Standards for Group 2 Room Air Emissions  

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  • Table 5 to Subpart O of Part 63—Standards for Group 2 Room Air Emissions

    As required in § 63.362(g), for your collection of Group 2 room air emissions, you must meet the applicable standard in the following table:

    For each . . . For which . . . You must . . . You must comply with the requirement(s) . . .
    1. Existing collection of Group 2 room air emissions at a major source facility a. Not applicable i. Operate all areas of the facility that contain Group 2 room air emissions with PTE, with all exhaust gas streams being captured and routed to a control system. Also,
    ii. Continuously reduce EtO emissions by 86 percent1     		No later than April 5, 2027.
    2. Existing collection of Group 2 room air emissions at an area source facility a. Facility EtO use is at least 20 tpy i. Operate all areas of the facility that contain Group 2 room air emissions with PTE, with all exhaust gas streams being captured and routed to a control system.2 Also,
    ii. Continuously reduce EtO emissions by 98 percent12     		No later than April 6, 2026.
    b. Facility EtO use is at least 4 tpy but less than 20 tpy i. Operate all areas of the facility that contain Group 2 room air emissions with PTE, with all exhaust gas streams being captured and routed to a control system.2 Also,
    ii. Continuously reduce EtO emissions by 80 percent12     		No later than April 6, 2026.
    c. Facility EtO use is less than 4 tpy Lower the EtO concentration within each sterilization chamber to 1 ppm before the chamber can be opened3 No later than April 5, 2027.
    3. New collection of Group 2 room air emissions at a major source facility a. Initial startup is on or before April 5, 2024 i. Operate all areas of the facility that contain Group 2 room air emissions with PTE, with all exhaust gas streams being captured and routed to a control system. Also,
    ii. Continuously reduce EtO emissions by 86 percent1     		No later than April 5, 2024.
    b. Initial startup is after April 5, 2024 i. Operate all areas of the facility that contain Group 2 room air emissions with PTE, with all exhaust gas streams being captured and routed to a control system. Also,
    ii. Continuously reduce EtO emissions by 86 percent1     		Upon startup of the source.
    4. New collection of Group 2 room air emissions at an area source facility a. Initial startup is on or before April 5, 2024, and facility EtO use is at least 20 tpy i. Operate all areas of the facility that contain Group 2 room air emissions with PTE, with all exhaust gas streams being captured and routed to a control system.5 Also,
    ii. Continuously reduce EtO emissions by 98 percent15     		No later than April 5, 2024.
    b. Initial startup is on or before April 5, 2024, and facility EtO use is less than 20 tpy i. Operate all areas of the facility that contain Group 2 room air emissions with PTE, with all exhaust gas streams being captured and routed to a control system.6 Also,
    ii. Continuously reduce EtO emissions by 80 percent16     		No later than April 5, 2024.
    c. Initial startup is after April 5, 2024, and facility EtO use is at least 20 tpy i. Operate all areas of the facility that contain Group 2 room air emissions with PTE, with all exhaust gas streams being captured and routed to a control system.5 Also,
    ii. Continuously reduce EtO emissions by 98 percent15     		Upon startup of the source.
    d. Initial startup is after April 5, 2024, and facility EtO use is less than 20 tpy i. Operate all areas of the facility that contain Group 2 room air emissions with PTE, with all exhaust gas streams being captured and routed to a control system.6 Also,
    ii. Continuously reduce EtO emissions by 80 percent16     		Upon startup of the source.

    1 This standard is based on a rolling 30-operating day average.

    2 The standard applies if the facility has met or exceeded the specified EtO use within any consecutive 12-month period after April 7, 2025.

    3 The standard applies if the facility has used less than 4 tpy of EtO within all consecutive 12-month periods after April 6, 2026.

    4 The standard applies if the facility is expected to meet or exceed the specified EtO use within one year after startup. Afterwards, the standard applies if the facility has met or exceeded the specified EtO use within any consecutive 12-month period after startup.

    5 The standard applies if the facility is not expected to meet or exceed 20 tpy of EtO use within one year after startup. Afterwards, the standard applies if the facility has used less than 20 tpy of EtO within all consecutive 12-month periods after startup.