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In its "Poisoned Places" series, NPR reports that industry here in Louisiana is emitting more smog-producing chemicals than it should and regulators…
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Scientists are trying to figure out how chemicals in the air interact with each other to make people sick. So they're building an instrument — a "lung in a box" — that goes way beyond the usual chemical monitors.
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Intensely smoggy days are striking less often thanks to better technology that pinpoints problems, and laws that have prompted fixes. Still, scientists say they haven't yet tracked down all the sources of the pollution fouling the region's air.