It looks like L.A. air could be killing us in more ways than one.

Two studies released Wednesday have linked toxic air pollution in Southern California to cancer and complications with birth.

Exposure to local traffic-generated pollution increased the risk of major complications and preterm birth, concluded a report published online in Environmental Health Perspectives. Local scientists studied the relationship of traffic pollution, preterm birth and a complication called preeclampsia that can lead to maternal and perinatal morbidity.

By measuring pregnant women's exposure to chemicals emitted by local traffic (nitrogen oxides and particulate matter), the researchers concluded that the risk for preeclampsia increased by as much as 42% at the highest exposures. The risk for "very preterm delivery" (meaning delivery when the fetus is less than 30 weeks old) increased by as much as 128% for women exposed to the highest levels.

The study was the first to look at the connection between preeclampsia and air toxics. It focused on births in Los Angeles and Orange counties.

Meanwhile, an Environmental Protection Agency study found that Los Angeles has some of the highest levels of cancer-related toxic air pollutants in the country. For residents of Cerritos, located at the heart of the L.A. basin, the EPA estimated the cancer risk due to air toxics at 1,200 in 1 million, the highest in the country and more than 33 times the national average. The statistic represents the expected number of additional deaths per million people, based on a lifetime exposure to the chemicals.