chemical from office supplies. OEHHA maintains a list of hazardous arts and crafts supplies that contain toxic substances which pose health dangers to children. California elementary schools are prohibited from purchasing these materials. OEHHA also provides advice on the selection and use of safer art supplies. OEHHA's research contributed to the phase-out of a toxic gasoline additive (MTBE) that contaminated groundwater throughout California. California was the first state to regulate a rocket fuel component which widely contaminates drinking water and produce including lettuce. OEHHA's research provided the basis for this drinking water standard. Traditional roles OEHHA's work products cover a variety of environmental media. Traditionally OEHHA has focused on four primary areas: Air pollution Health-based air quality standards for pollutants associated with smog Health effects assessments for toxic air contaminants. List of toxic air contaminants that disproportionately impact children Indoor air guidelines for green building Water pollution Fish consumption advisories including warnings for pregnant women and children Health protective levels for contaminants found in drinking water Proposition 65: Carcinogens and Reproductive Toxicants Maintain Proposition 65 list of chemicals known to be carcinogens and reproductive toxicants Health-based assessments of safe levels for Proposition 65 carcinogens and reproductive toxicants Multimedia risk assessment Assess human and ecological health risk from exposure to chemicals contaminating California sites or facilities Multimedia evaluation of the health effects of fuels More recently In recent years OEHHA has taken on new mandates to address emerging environmental issues of particular concern to the California public: Biomonitoring – Evaluation of priority chemicals for Biomonitoring in California Green Chemistry – Identification of key hazards of chemicals for implementation of green chemistry laws Occupational health – Advice on health-based occupational exposure limits Dry Cleaning – Research on safer alternative methods for dry cleaning Environmental Justice Cumulative Impacts Emergency response for release of hazardous chemicals Evaluation of contamination from oil spills Evaluation of chemical sprays used to control invasive species Child-specific health-based reference doses used to evaluate toxic chemicals found at school sites Climate change – Identification of health effects Involved in the light brown apple moth controversy: Issued report on the complaints of adverse health effects after aerial spraying in Monterey and Santa Cruz. Organizational structure OEHHA has three main divisions: Administrative Support Services Division Office of External and Legislative Affairs Scientific Affairs Division The Scientific Affairs division is composed of four scientific branches that correspond to the scientific duties: Air Toxicology