an atmospheric condition in which suspended particles in the air rob it of its transparency
the city's smog was once so bad that darkness often prevailed, even at noon
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Recent Examples of smogGas appliances in Maryland homes and buildings produce over one-fifth of the state’s nitrogen oxide emissions, a major driver of smog with annual health costs of about $1.3 billion.—Laurel Peltier, Baltimore Sun, 19 Mar. 2026 The state also is transitioning to a summertime blend of cleaner-burning, lower-volatility fuel mandated to reduce smog, typically required from April 1 through Oct. 31.—Pat Maio, Oc Register, 3 Mar. 2026 As combustion has ceased, the system also reduces CO2 and other emissions, helping to reduce smog and pollution.—Michael Harley, Forbes.com, 24 Feb. 2026 The air is thin and cool, but also thick with vog—volcanic smog—that turns the sun into a pale, bruised disc overhead.—Tommy Orange, Condé Nast Traveler, 31 Jan. 2026 See All Example Sentences for smog
In cases of near-zero visibility due to dense fog, initiate your hazard lights and locate a secure spot, such as a nearby business parking area, to pull over and come to a halt.
—
NC Weather Bot,
Charlotte Observer,
31 Mar. 2026
The agency warns that glare, fog and choppy water can make small craft hard to spot.