This page last reviewed July 16, 2015

HARP Overview

The Hotspots Analysis and Reporting Program Version 2 (HARP 2) is an updated software suite used to assist with the programmatic requirements of the Air Toxics "Hot Spots" Program (Assembly Bill 2588).  This version replaces the prior version (HARP 1) and incorporates the information presented in the 2015 Air Toxics Hotspots Program Guidance Manual for Preparation of Health Risk Assessments.  HARP 2 separates the modules into three programs which allow the users to access any of the modules independently of each other.  The three programs are referred to as the Emissions Inventory Module (EIM), Air Dispersion Modeling and Risk Tool (ADMRT), and Risk Assessment Standalone Tool (RAST).  HARP 2 can be used by the air pollution control and air quality management districts (districts), facility operators and other organizations or individuals to promote statewide consistency, efficiency and cost-effective development of facility emission inventories and conducting health risk assessments.  HARP 2 can also be used for conducting health risk assessments used in other programs (e.g., facility permitting, CEQA reviews).  Listed below are the descriptions of each program.  

 What can HARP 2 do?
 Create and manage facility emission inventory database
Databases can be transmitted to the local air districts and the ARB for use in their inventory reporting program
 Calculate facility prioritization scores

Perform atmospheric dispersion analyses using the U.S. Environmental Protection Agency's atmospheric modeling software AERMOD
Calculate cancer and noncancer (acute and chronic) health impacts from AERMOD data using 2015 OEHHA health risk assessment guidance

Calculate cancer and non-cancer (acute, 8-hour, and chronic) health impacts using ground level concentrations
Uses point estimates or data distributions of exposure to calculate inhalation and multipathway risks
Perform spatial averaging on concentrations and risk from various pathways and receptors
Calculate population exposure
Calculate cumulative impacts for one or multiple facilities and one or multiples pollutants

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HARP Frequently Asked Questions

What's New

  • HARP2 is updated on July 16, 2015.  HARP 2 is now available for use developing facility emission inventories and conducting health risk assessments.  HARP2 can calculate Tier 1 and Tier 2 risk assessments.  The ability to conduct Tier 3 and Tier 4 risk assessments will be completed by fall 2015.  

HARP Archive 


Please email questions to HARP.