Three recent studies examine the effectiveness and unintended consequences of banning religious exemptions to childhood vaccinations in California schools.

After the launch of an initiative to reduce maternal mortality in California, the maternal death rate fell by nearly half.

After the passage of California’s Proposition 47, which reduced criminal penalties for drug possession, felony drug arrest rates declined and racial disparities among these arrests decreased.

California’s eugenic sterilization program disproportionately targeted Latinos, and especially Latina women, new research finds.

Teens with harsh fathers commit more crime and use a larger variety of drugs and alcohol, a new study suggests.

One-third of African American men have been convicted of a felony, according to data recently published in Demography. For white men, the figure is less than half that.

Among the elderly, women and black people are more likely to be admitted to the hospital from exposure to wildfire smoke than men and people of other races.

2015 review of scholarship on impact of air pollution in the United States, including health effects, economic costs and automotive and transportation causes.

2012 study in PNAS on the frequency of wildfires in the American West over the past 3,000 years and the implications for larger wildfires.

2014 and 2009 studies from U.C. Riverside, Yale and the Harvard Kennedy School on the relative merits of policies to encourage efficient use of scarce water resources.