The California Health Interview Survey (CHIS) has released new data based on interviews with more than 44,000 households in California. The survey, conducted by the UCLA Center for Health Policy Research, covered hundreds of topics affecting state residents’ health and well-being, including asthma. The data were released on AskCHIS, the Center’s free and easy-to-use web tool that provides data by state, region, county and some service-planning areas in Los Angeles and San Diego counties. Even more data were released through free, downloadable public-use files from the CHIS website. The data represent a two-year (2011-2012) effort to survey a representative sample of Californians in all 58 counties. CHIS is the largest state health survey in the nation and one of the few to provide robust samples of many typically underrepresented racial and ethnic groups.