DC experiences ‘Code Red’ air quality after massive fireworks display

DC experiences ‘Code Red’ air quality after massive  fireworks display
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By Camila DeChalus, CNN (CNN) — Residents of Washington, DC, on Sunday briefly experienced the worst air quality of any major city in the world, according to a company that ranks pollution globally, as the capital reckoned with the aftermath of a massive, 40-minute Fourth of July fireworks show...