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Air Toxics Program

New York's air program protects the public and the environment from the adverse effects of exposure to toxic air contaminants. The regulatory requirements of the air toxics program in Part 212 determines how much control is needed to reduce air pollution.

Part 212 was updated on June 14, 2015. To assist the public with understanding the changes, the Division of Air Resources released Policy DAR‐1: Guidelines for the Evaluation and Control of Ambient Air Contaminants under Part 212 (PDF). DAR-1 provides guidance to DEC permitting staff, the public, and the regulated community on the requirements of the air toxics program. DAR-1 outlines the control requirements for the emissions of air toxics based on an assigned Environmental Rating and DAR-1 also provides guidance for implementing the regulation.

AERSCREEN Modeling Software (Version 19191)

An essential component of deriving an Environmental Rating is determining the air concentration of the pollutant near the fence line. The AERSCREEN modeling software is able to perform this step. The modeled air concentration should be compared to the acceptable health-based concentration.

To assist the public to calculate the air concentration of the pollutant near the fence line, DEC is offering access to the USEPA's AERSCREEN model. The AERSCREEN model includes several component files which need to be incorporated into the AERSCREEN executable file to run properly. The AERSCREEN model can be downloaded as a zip file. DEC has included both the USEPA's user guide and a condensed DEC user guide with suggestions on default options and programmatic contacts.

A new feature has been added to the AERSCREEN download, an Excel spreadsheet incorporating the AGC/SGC tables. The spreadsheet will allow the user to input data from multiple emission points and evaluate the offsite emissions by emission point and facility wide.

AERSCREEN Software Program Files

File Download and Set-up
  • On the C:\ drive, create a subfolder called C:\AERSCREEN.
  • Using WinZip, extract the files to the C:\AERSCREEN directory. The program needs all the files within the zip bundle to execute properly.
  • After unzipping the files to the C:\AERSCREEN directory, locate the DEC AERSCREEN User Guide.pdf for instructions to properly set up working directories and running the model.

Download AERSCREEN-32

Download AERSCREEN-64

2016 DAR-1 AGC/SGC Tables

DEC established a listing of non-criteria air contaminants with acceptable ambient air concentrations to help the user of DAR-1 make an appropriate Environmental Rating determination. The acceptable air concentrations, in micrograms per cubic meter, are listed for annual emission rates (called Annual Guideline Concentrations (AGC)) and for hourly emission rates (called Short-Term Guideline Concentrations (SGC)). A listing of AGC/SGCs were incorporated into the 1991 draft version of Air Guide-1 (DAR-1) under Appendix C and revised in 1995, 2000, 2003, 2007, 2010 and 2014. The current 2016 AGC/SGC tables are located in Appendix A of DAR-1 (PDF).

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