San Diego–Chula Vista-Carlsbad, CA > Average high ozone days per year: 29.3 > Average 24-hour unhealthy particle pollution: 12.0
The Smoggiest Cities in America – 24/7 Wall St.
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San Diego–Chula Vista-Carlsbad, CA > Average high ozone days per year: 29.3 > Average 24-hour unhealthy particle pollution: 12.0
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