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General Information
Freely Available: Yes
This informational text resource is intended to support reading in the content area. Smog began appearing in Los Angeles in the 1940s and became a problem for decades. Scientists were able to figure out the cause of smog only after intensive study of organic compounds in the air. After discovering that nitrogen oxides from car exhaust were a primary ingredient in smog, it took years of policy changes and industrial innovation to reduce air pollution and resolve the smog issue in LA and worldwide.
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