This week (July 14–16, 2026), smoke from 800+ active Canadian wildfires triggered air-quality alerts across 17+ U.S. states and reached more than 100 million Americans — Ontario's fires don't stop at the border, and neither does their cost. Researchers price it at roughly $125 billion a year drained from U.S. paychecks (about 2% of labor income, with a heavy-smoke day cutting quarterly earnings ~0.1%), about $16 billion a year in added U.S. health costs, and a California-smoke death toll of 52,500–55,700 from 2008–2018 — a $432–456 billion burden. The smoke starts in Canada; the bill — tens of billions a year in lost wages and healthcare — is paid by American households. Sources: CBS / NBER, NRDC, and UCLA / Science Advances.