Emission Inventory and Risk Glossary

This page last reviewed March 13, 2013


Cancer Risk:   The theoretical probability of contracting cancer when continually exposed for a lifetime (70 years) to a given concentration of a substance. The probability is usually calculated as an upper confidence limit. The maximum estimated risk may be presented as the number of chances in a million of contracting cancer.
     
CAS:   Chemical Abstract Services (CAS) Registry Number is assigned to each pollutant. Do not use dashes when using a CAS # to query the CEIDARS database.
     
CEIDARS:   The California Emission Inventory Database and Reporting System (CEIDARS) contains all of the emissions data for point sources at ARB.
     
CERR:   CERR, the Consolidated Emission Reporting Rule, is a US/EPA requirement for certain classes of facilities.
     
CHAPIS:   CHAPIS, the Community Health Air Pollution Information System, provides interactive maps of air pollution emission sources over the web.
     
Database Year:   Criteria Pollutant data are available for a variety of database years. Toxics inventory data are available from 1996 to 2003 database years; however, toxic emissions may be derived from earlier emission inventory years. The toxics data are submitted to the ARB by the local air districts as a requirement of the Air Toxics "Hot Spots" Program. This Program requires emission inventory updates every four years, although more frequent updates may occur.
     
Facility ID:   Facility ID is a number that identifies a particular facility. This number is assigned to the facility by the local Air District responsible for this facility.
     
Facility Name:   When you search for specific facilities, remember that names will often be abbreviated; i.e. "Northern California Electric" facilities may appear both spelled out and abbreviated as both "N.C.E." and "NCE", depending on how the information was submitted by the facility owner.
     
Facility Prioritization Score:   Districts prioritize facilities in the "Hot Spots" program and assign a cancer, chronic, and acute prioritization score based on those emissions. In addition to the quantity of emissions, the district's evaluation considers other factors such as the toxicity of each substance emitted from the facility. If the prioritization score is greater than the District threshold, the facility must conduct a health risk assessment. For more information see the CAPCOA Facility Prioritization Guidelines, 1990.
     
Facility Standard Industrial Classification (SIC) Code:   This is a list of codes that represent various industrial classifications. This list is maintained by the US Office of Management and Budget. For example, SIC Code 2512 is used for facilities that make "Upholstered Household Furniture". One site that allows searches for particular SIC codes can be found at the US Dept. of Labor OSHA SIC Search.
     
Health Risk Assessment (HRA):   A comprehensive analysis of the dispersion of hazardous substances in the environment, their potential for human exposure, and a quantitative assessment of both individual and population-wide health risks associated with those levels exposed. For more information see the OEHHA Air Toxics "Hot Spots" Program Risk Assessment Guidelines (August 2003).
     
Non-Cancer Acute
Hazard Index:
  The potential non-cancer health impacts resulting from a one-hour exposure to toxic substances. The total hazard index includes the sum of hazard indices for pollutants with non-cancer health effects that have the same or similar adverse health effects (endpoints). An acute hazard index is calculated by dividing the one-hour concentration of a toxic pollutant by the acute reference exposure level for that pollutant.
     
Non-Cancer Chronic Hazard Index:   The potential non-cancer health impacts resulting from exposure to toxic substances usually lasting from one year to a lifetime. The total hazard index includes the sum of hazard indices for pollutants with non-cancer health effects that have the same or similar adverse health effects (endpoints). A chronic hazard index is calculated by dividing the annual average concentration of a toxic pollutant by the chronic reference exposure level for that pollutant.
     
Notification Levels:   The district established levels where the results of the health risk assessment required under the Hot Spots Program are considered significant enough to notify the affected residents and businesses near a facility of the potential health impacts from that facility's emissions.
     
Prioritization Thresholds:   These levels, established by each district, define a facility's requirements under the Hot Spots Program based on the prioritization score calculation. Commonly, there are two thresholds, an upper and lower that may be different for cancer and non-canceer prioritization evauations. Facilities with a score above the upper threshold are high priority and must perform a health risk assessment. Facilities below the lower threshold are low priority. Facilities that fall between the two thresholds are called intermediate priority and, at the district's discretion, may be required to perform a risk assessment.
     
Program Status:   The current facility status in the "Hot Spots" Program (active, exempt, etc). The district may need to be contacted for specific details concerning applicability to the program, exemption, and the extent to which a facility has fulfilled emission inventory reporting and HRA requirements. Code: A - Priority Score > 10; B - 10<Risk<50; C - 50<Risk<100; D - Risk > 100; E - Unprioritized; F - 1<Risk<10; G - exempt or out of business.
     
Risk Reduction Audit and Plan (RRAP) Levels:   The district established levels where the results of the health risk assessment required under the "Hot Spots" Program are considered significant enough to require the facility to prepare and implement measures to reduce its emissions and potential health risk.


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