Lawrence Berkeley National Laboratory is conducting the Healthy Homes Indoor Air Quality Study to investigate the impact of natural gas appliances on indoor air quality in California homes. In the first phase of this study, we measured air pollutant concentrations, temperature and relative humidity over six day periods in approximately 350 homes across California. Measurements were made of carbon monoxide (CO), nitrogen dioxide (NO2), total nitrogen oxides (NOX), formaldehyde (HCHO) and acetaldehyde (C2H4O). We collected information about the buildings, appliances and household activities through telephone interviews of participants. Some homes without natural gas appliances were included in the study to provide a basis for comparison.

We are no longer seeking participants for the first phase of the study. We will update this web site when we open recruitment for the additional phases of the study.

If you are interested in seeing the results from the first phase of the study, please go to the "Results" page. The Results page will be updated as more results become available.