Search Frequent Questions

Displaying 1 - 15 of 80 results

• Where can I find older NEI data (prior to 2008)?

  The raw data and summaries that are still available (dating back to 1990) can be obtained from the web page https://www.epa.gov/air-emissions-inventories/pollutant-emissions-summary-files-earlier-neis . Starting with 2001 data, a more limited selection of summary files are available.

  • Last published: March 18, 2024

• CFAT Impacts on EPCRA and RMP

  The Department of Homeland Security’s Chemical Facility Anti-Terrorism Standards (CFATS) impose comprehensive federal security regulations for high-risk chemical facilities. Do the CFATS alter the requirements that apply to a facility covered under both CFATS and either the Emergency Planning and Community Right-to-Know Act (EPCRA) or the Clean Air Act section…

  • Last published: April 9, 2024

• EPCRA Reporting Mechanisms for Protecting Sensitive Business Information

  Does EPCRA provide any mechanisms for facilities that must submit Tier II inventory information to protect sensitive business information? Trade secret and confidential location information (CLI) are two separate confidentiality provisions under EPCRA. Trade secret claims made under EPCRA Sections 303, 311, 312, or 313 allow facilities to claim the…

  • Last published: April 9, 2024

• How do the different parts of particulate matter (PM) fit together?

  The various parts of PM in the NEI are related as follows. PM10-FIL > PM25-FIL because PM10-FIL includes PM25-FIL PM25-PRI = PM25-FIL + PM-CON This equation only applies at the process level. Because some sources only can report PM2.5 (due to test method differences), this equation does not apply to…

  • Last published: April 17, 2024

• How does PM2.5 relate to PM species such as EC, OC, SO4, NO3, PMFINE, and DIESEL-PM25?

  Primary PM2.5 estimates are speciated into the five PM species in the NEI: elemental (black) carbon (EC), organic carbon (OC), nitrate (NO3), sulfate (SO4), and the remainder of PM25-PRI (PMFINE). Diesel engine PM25-PRI and PM10 emissions are also labeled as DIESEL-PM25 and DIESEL-PM10 for mobile source diesel engines. For all…

  • Last published: April 17, 2024

• May I use the pamphlet “Protect Your Family From Lead in Your Home” to meet my obligations for pre-renovation education under the RRP Rule?

  Answer: No. As of December 22, 2008, only the pamphlet “ Renovate Right ” may be used to comply with the pre-renovation education requirements of the RRP Rule. “ Protect Your Family ” is still available for use during real-estate sales and lease transactions and for general information. Question Number…

  • Last published: November 5, 2024

• My firm is replacing windows in a condominium. Is this type of exterior work considered work in a common area, and if so, must other owners and occupants be informed about the job?

  Exterior renovations of multi-unit target housing are considered renovations of a common area. A common area is a portion of a building that is generally accessible to all residents or users of the building. Renovations in common areas of multi-unit target housing, such as condominiums, must be performed in accordance…

  • Last published: November 19, 2024

• Under the Pre-Renovation Education Rule, I have the option of using a certificate of mailing to notify the owner or occupant. What is the difference between a certificate of mailing and certified mail?

  A certificate of mailing is a receipt showing evidence of mailing, while certified mail provides proof of mailing and delivery of mail. When using the certificate of mailing option, no record is kept at the mailing office and a receipt is not obtained when mail is delivered to the addressee…

  • Last published: November 19, 2024

• When multiple contractors are involved in a single renovation, must every contractor provide pre-renovation education? Can a certified firm assign its responsibility to a property management company?

  All firms performing, offering or claiming to perform renovations are responsible for ensuring compliance with the pre-renovation education requirements of the RRP Rule. However, it is unnecessary for the same notifications and information to be given out repeatedly during a single renovation. Accordingly, a firm may discharge the task by…

  • Last published: November 20, 2024

• Where can I download hourly emissions data from continuous monitoring?

  Hourly emissions data files are available from the Clean Air Markets Division of EPA, collected as part of 40 CFR Part 75. The download location has changed in February, 2023. The new location is https://campd.epa.gov/data/bulk-data-files . Once on this new site, use the menu (at the left) and the Keyword…

  • Last published: January 7, 2025

• Are landfills covered under Title III of SARA since they are covered by RCRA?

  Yes, landfills are subject to certain Title III requirements. Subtitle A of Title III is intended to identify facilities which present a potential hazard for a chemical emergency and to provide a process for local emergency planning committees to engage with such facilities in determining the significance of the release…

  • Last published: April 12, 2024

• What sources make up the Tier 1 categories used in the emissions trends?

  Tier 1 categories are assigned by source classification codes (SCCs) that are the most specific processes available in the NEI. The latest SCC list with the Tier 1 assignments can be downloaded from the EPA SCC website in Comma Separate Values (CSV) format.

  • Last published: May 1, 2024

• What is the cause of the large decrease in electric utility emissions, particularly sulfur dioxide, starting in 1995?

  SO2 emissions reductions from utilities during this time are primarily attributed to the impacts of the acid rain program. As described on EPA’s Acid Rain Program web page, Phase 1 of this program began in 1995 and affected 263 units at 110 most coal-burning electric utility plants in 21 eastern…

  • Last published: May 1, 2024

• Are mobile boosters eligible for the transportation exemption?

  An oil company owns many wells on an oil field. Each well is on its own plot of land. These plots are not adjacent or contiguous and, therefore, each well is its own facility. When operating these wells, it is sometimes necessary to inject air or gas into the well…

  • Last published: May 8, 2024

• Can I get access to the Emissions Inventory System if I am not a data provider to EPA?

  The Emission Inventory System (EIS) is a secured database for EPA and State/Local and Tribal Air Agencies only. The EIS is used to develop the National Emission Inventory (NEI). While you cannot have access to EIS, you can have access to the current and past NEIs through EPA’s NEI website…

  • Last published: May 28, 2024