Yifang Zhu in SicenceBlog.com: With older, gas-fired appliance use unhealthy air in homes is oftentimes found

The gas-fired appliances found in 90 percent of Californian’s homes cause unhealthy air and drive annual healthcare costs into the billions, according to new research from UCLA Fielding School of Public Health. 

“‘California’s state agencies often focus on greenhouse gas emissions and climate change impacts, but there has been much less focus on how fossil fuel use in household appliances can adversely impact indoor air quality and public health,’ said lead researcher and UCLA Fielding School of Public Health Professor Yifang Zhu. ‘The goal of this report is to provide information to Californians on how pollution from gas-fired appliances affects the air they breathe, and the related health effects.”