Los Angeles is a trap. Everyone who lives there knows it. The basin formed by the ring of mountains around the city traps smog, preventing it from dissipating safely into the inland desert.

Imagine living in Los Angeles in the early ... studying this protective ozone layer from space. While OMI was not designed to study ground-level ozone, it provides scientists with a global view of a ...

Environmental and public-health groups filed a lawsuit today against the Environmental Protection Agency for failing to ensure that Los Angeles, Sacramento and New Hampshire have effective plans to ...