Definition of "smoggiest" []

• Superlative form of smoggy: most smoggy. (adjective)

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• "On a late afternoon, nearing sunset, during the smoggiest season of the year, winter, your bus or car is climbing the mountains to the east."
• "The MTA began purchasing cleaner-running buses nearly 20 years ago in an effort to reduce vehicle emissions in one of the smoggiest regions of the country."
• "•The Los Angeles metro area remains the smoggiest, although it's improved significantly in the last decade."