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Climate change and drought are worsening California's air quality. -

The state has worked hard to improve fuel standards and reduce smog, but more dust, wildfires, and grass fires have led to an unhealthy rise in particle pollution, particularly in the Central Valley. Los Angeles Times

With this order, California sets a very high bar for itself and other states and nations, but it’s one that must be reached—for this generation and generations to come.

Governor Jerry Brown announcing the state's new emissions targets

Air pollution may raise the risk of premature brain aging. -

A new study found that those with greater exposure to PM 2.5 were more likely to have certain types of brain damage and decreased cerebrum volume. (Holding your breath won't do your brain any favors, either.) New York Times

A Senate committee has voted to restrict the EPA's use of science. -

The so-called "secret science" bill would prevent the agency from developing regulations using studies whose results aren't publicly available online. President Obama has threatened a veto if the bill makes it to his desk. The Hill

A widespread diabetes drug feminizes fish. -

A new study found that exposure to metformin—one of the most common pharmaceuticals found in wastewater—made male minnows more feminine and less fertile. Hormone-mimicking drugs have previously been linked to reproductive problems in fish (but metformin isn't one of those). Environmental Health News

Researchers have found the world's most-polluted bird. -

A Cooper's hawk from Vancouver had more than 10 times the average levels of PBDE flame retardants in its liver. PBDEs are no longer in use in Canada and the United States, but the chemicals still linger at dangerous concentrations in the environment and wildlife. Smithsonian