California Air Resources Board

Chemical Use Category -These are convenient, broad types of usage that allow the user to select groups of chemicals together, based on ways they are commonly used, e.g., Pesticides, vs. Flame retardants, vs. Adhesives.  

Health Effects- Associated health effects for a given pollutant type. 

Reporting Group -The Reporting Group identifies the pollutant’s Regulatory Reporting Group. It provides a convenient way to ensure closely related chemicals can be queried/retrieved together, with none overlooked. For example, using the Reporting Group ensures that all hexavalent chromium-containing compounds that are reported (which may include various individual compound instances listed in Appendix A), will all be retrieved, rather than possibly missing some when querying only a specific, individual compound instance. (For example, it avoids only querying “Barium chromate” but missing others like “Chromium trioxide”, both of which are hexavalent chromium-containing compounds, and which would be correctly found by using the complete Reporting Group called “Chromium, hexavalent and compounds”). 

Substance Name –Individual chemical substance name as listed in the pollutant table withinCalifornia's Emission Inventory Development and Reporting System(CEIDARS). The CEIDARS Pollutant table lists all the pollutants maintained in CEIDARS. It shows the pollutant long and short names by pollutant ID. The POLABBREV field or Pollutant Abbreviation, is a shortened version of the pollutant or substance name. Individual substances listed under a group heading must be reported individually.  Other, unspecified substances in the group must be summed and reported using the emittent ID of the group heading.  

Chemical Structure–Image of the chemical structure (https://pubchem.ncbi.nlm.nih.gov/). 

OEHHA Inhalation Cancer Potency Factor (mg/kg-d)^-1 -The Office of Environmental Health Hazard Assessment (OEHHA) uses an oral cancer slope factor (OSF) to estimate the increased lifetime cancer risk from oral exposure to a chemical, emitted to the air but depositing via multipathway exposure routes such as onto homegrown gardens, drinking water bodies, etc . This OSF is expressed as (mg/kg-d)-1, meaning it estimates the incremental lifetime risk of cancer per milligram of the chemical ingested per kilogram of body weight per day. The OSF is multiplied by an estimate of lifetime exposure to estimate the lifetime cancer risk. 

OEHHA Inhalation Cancer URF (µg/m3)^-1 -The Office of Environmental Health Hazard Assessment (OEHHA) Cancer Unit Risk Factor (URF) values are used to estimate lifetime cancer risks associated with inhalation exposure to a carcinogen at a given air concentration (in micrograms per cubic meter). 

OEHHA Oral Cancer Slope Factor (mg/kg-d)^-1-The Office of Environmental Health Hazard Assessment (OEHHA) uses an oral cancer slope factor (OSF) to estimate the increased lifetime cancer risk from oral exposure to a chemical, emitted to the air but depositing via multipathway exposure routes such as onto homegrown gardens, drinking water bodies, etc . This OSF is expressed as (mg/kg-d)-1, meaning it estimates the incremental lifetime risk of cancer per milligram of the chemical ingested per kilogram of body weight per day. The OSF is multiplied by an estimate of lifetime exposure to estimate the lifetime cancer risk. 

OEHHA Oral Chronic REL (mg/kg-d) - The Office of Environmental Health Hazard Assessment (OEHHA) uses an oral cancer slope factor (OSF) to estimate the increased lifetime cancer risk from oral exposure to a chemical, emitted to the air but depositing via multipathway exposure routes such as onto homegrown gardens, drinking water bodies, etc . This OSF is expressed as (mg/kg-d)-1, meaning it estimates the incremental lifetime risk of cancer per milligram of the chemical ingested per kilogram of body weight per day. The OSF is multiplied by an estimate of lifetime exposure to estimate the lifetime cancer risk. 

OEHHA 8-hour Inhalation (µg/m3)^-1 - The OEHHA 8-hour Inhalation, expressed as the inverse in micrograms per cubic meter (µg/m³)-1.This value represents an inverse airborne concentration of a chemical at or below which non-cancer health effects are not anticipated for repeated 8-hour exposures. 

OEHHA Inhalation Acute REL (µg/m3) - The Office of Environmental Health Hazard Assessment (OEHHA) Acute Reference Exposure Level (REL) is an airborne level exposure that is not likely to cause adverse non-cancer health effects in a human population, including sensitive subgroups, exposed to that concentration for one hour on an intermittent basis. 

OEHHA Inhalation Chronic REL (µg/m3) -The Office of Environmental Health Hazard Assessment (OEHHA) Acute Reference Exposure Level (REL) is an airborne level exposure that is not likely to cause adverse non-cancer health effects in a human population, including sensitive subgroups, exposed to that concentration for one hour on an intermittent basis. 

Chemical Use Description – The Use List provides information on how toxic substances may be used. This information is not intended to be an exhaustive list but provides insight on how and why the substance is being used (such as industry type, manufacturing process or products). 

Emittent ID: A unique identifier for the emittent or source of the substance. The Emittent ID is also the Chemical Abstract Service (CAS) number, where available, or a CARB-assigned 4-digit ID where a CAS number is not available. 

MW (g/mol) - The molecular weight of the substance, a fundamental chemical property. 

OEHHA MWAF -The Office of Environmental Health Hazard Assessment (OEHHA) molecular weight adjustment factor (MWAF) is used in risk assessments and inventory purposes for toxic metals and their compounds.This adjustment is necessary because OEHHA's health values, such as cancer potency factors and non-cancer Reference Exposure Levels (RELs), are often based on the weight of the toxic metal atom rather than the entire molecular weight of the compound. 

Vapor pressure (mmHg) - The vapor pressure of the substance at 25 degrees Celsius, indicating its volatility. This is a crucial property for assessing potential inhalation exposure. 

Vapor Pressure Reference Temperature (˚C)- specific temperature at which the vapor pressure of a substance is known or measured, providing a benchmark for understanding and comparing its volatility 

M.p. (˚C) - The melting point in degrees Celsius, the temperature at which the substance changes from a solid to a liquid. 

B.p. (˚C) - The boiling point in degrees Celsius, the temperature at which the substance changes from a liquid to a gas. 

Solubility - Information on how the substance dissolves, particularly its reactivity or solubility in water or organic solvents, which is important for understanding its behavior in the environment and biological systems. 

Approved Methods for Sampling & Laboratory Analysis -Contains a list of standard or approved methods for collecting samples of the substance from the environment (e.g., air) and analyzing them in a laboratory.  

Summary of Analytical Method -A brief description of the analytical technique used to measure the substance. This provides insight into the instrumentation and process involved in identifying and quantifying the chemical in a sample (e.g., GC/MS, HPLC, ion selective electrode).