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  • 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…

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  • How complete are the data in the National Emissions Inventory?

    While the goal of the National Emissions Inventory (NEI) program is to include all emissions data, there are always challenges meeting this goal. The answer about completeness of coverage of sources depends on the emissions sector and pollutant. In general, the criteria air pollutants and precursors (CAPs) are expected to…

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  • Where is more information available about emissions estimation methods used by the EPA?

    For criteria air pollutants and precursors as well as for hazardous air pollutants, the methods are described in the technical support document (TSD) for the latest National Emissions Inventory (NEI) available from the main NEI page . For greenhouse gas emissions, you can find greenhouse gas inventory methods from the…

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  • Will there be an increase in turbidity (cloudiness or muddiness) or silt in the streams?

    The increased flow from this work is expected to be minimal and should not impact turbidity or silt.

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  • Will returning the natural flow of water to Sulphur Run disturb areas with sheen?

    Conditions in the streams are much improved because of previous cleanup work conducted in 2023. Although oily sheens remain, they are settled in the sediment and do not impact surface water unless disturbed. The increased water flow to Sulphur Run will be minimal and is not expected to disturb sheen…

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  • How are emissions trends compiled?

    For criteria air pollutants and precursors, the emissions trends are based on the triennial National Emissions Inventory data, with some interim year data included for non-triennial years. The methods and interim-year approaches are described on the “Development of Data” tab included with the data provided on the Air Pollutant Emissions…

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  • How do I determine what SCCs have changed between inventory years?

    These are available in the EIS (Reporting Code table) or public website: https://sor-scc-api.epa.gov/sccwebservices/sccsearch/ Filter on “last inventory year” to remove SCCs no longer active. If this column has a date in it, then the SCC has been retired as of that date. The “last updated date” (column J) indicates when…

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  • What is the status of the cleanup at the site?

    In October 2023, it was announced that the excavation work, which removed the known areas of contaminated soil at the derailment site, was complete. The soil double-check work has been ongoing for months and is expected to continue into the fall. The timeline of our expected completion plans for final…

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  • When can we access the streams again?

    The upcoming cleanup efforts will focus on oil-based compounds which, based on recent sampling, are the only derailment-related contaminants remaining in the creeks. Please obey all posted signage and continue to avoid access in Sulphur and Leslie Runs until further notice.

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  • What has changed?

    For the past several months as the collected wastewater has gone through the system, sample results have shown that the wastewater meets the standards set for vinyl chloride and other derailment-caused contaminants without treatment, meaning it can be disposed of as non-hazardous waste. Testing of the collected wastewater will continue…

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  • Why collect the rainwater and snowmelt around the derailment site?

    Until excavation work and confirmatory sampling are completed, any wastewater collected from the derailment site is considered a “listed hazardous waste” because it may have come into contact with vinyl chloride or other hazardous contaminants from the derailment. Even though the soil contamination has been removed, our double-check work is…

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  • Where are the NAICS/ SIC and SCC codes changes that have been implemented for the 2017NEI?

    Please refer to the NEI webpage for 2017 documentation , and follow the link for Appendix 2 - 2017 NEI Plan Code Changes. That Excel file describes anticipated changes for the SCCs and NAICS and includes a helpful read me. I'll just note in the next NEI/EIS email that SCC…

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  • Where can I find biomass emission limits for biomass burning in industry? I am looking for limits on particulate matter, SO2 and NOx.

    For information on EPA air emission standards for industrial sources, please visit this website. If you need additional help with specific questions, please use the contact us link on one of these pages to inquire further with staff in the emission standards program. New Source Performance Standards

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  • How often are the NEI data updated and how frequently are the data published?

    The full NEI is created for every third inventory year (e.g., 2008, 2011, 2014, and 2017). The data for each version has been updated two times each for the 2008, 2011, and 2014 NEI cycles. For the 2017 NEI and beyond, the EPA is trying to publish only a single…

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  • What is the status of the cleanup work in the streams?

    There is still more work to be done in Leslie and Sulphur Runs. EPA and Ohio EPA are reviewing the Norfolk Southern sediment mitigation workplan. More cleaning will likely start before April and is expected to continue through July.

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