News Clark County receives F from American Lung Affiliation in 'State of the Air 2026' report By LasVegasNews - April 23, 2026 0 FacebookTwitterPinterestWhatsAppLinkedinReddItEmailPrintTumblrMixDiggFlipCopy URL The American Lung Affiliation launched its “State of the Air 2026” report, which gave Clark County an F grade and ranked the Las Vegas valley as one of many worst metropolitan areas for prime ozone days.