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The largest problem is the dangerous amount of nitrogen oxide (which mixes with vehicle-exhaust gas to create ozone, and then smog) coughed out by the state's industrial plants.
ECONOMIST: The Lone Smog State
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Mr. Obama personally said he would jettison the EPA rule that would have reduced smog-forming ozone levels.
WSJ: For Obama, Jobs Are a Focus for Regulations
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In urban air ozone is a component of smog, which damages lungs.
FORBES: The Ozone Solution
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Ms. Jackson late last year delayed a decision on whether to tighten the government's limits on ground-level ozone, a primary ingredient in smog.
WSJ: EPA Tangles With New Critic: Labor
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The ALA assessed levels of ozone pollution, more commonly known as smog, and levels of particle pollution, or air-born toxins that can potentially be lethal if inhaled at high enough levels.
FORBES: List: America's Most Polluted Cities
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It also ranked second-worst, behind Los Angeles, for smog levels, known formally as ozone pollution.
FORBES: Magazine Article