California blames EPA for stalled plans to curb pollution

California's top clean-air official fired back against Trump administration charges that the state hasn't done enough to fight pollution within its borders, saying the U.S. Environmental Protection Agency should "do its job."

EPA moves from air to water in its criticism of California

The Trump administration warned California officials Thursday that the state is "failing" to meet federal water quality standards, the latest move in the president's escalating political feud with the state's liberal leaders.

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Air pollution

Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or damages the natural environment, into the atmosphere.

The atmosphere is a complex, dynamic natural gaseous system that is essential to support life on planet Earth. Stratospheric ozone depletion due to air pollution has long been recognized as a threat to human health as well as to the Earth's ecosystems.

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