Definition of smog in English:



  • [mass noun] Fog or haze intensified by smoke or other atmospheric pollutants:

    ‘exhaust emissions are mainly responsible for the smog’
    [count noun] ‘the fires caused widespread smogs’
    • ‘All I remember in the air in 1977 was smog from all the coal-burning chimneys.’
    • ‘Ethanol has also been found to contribute to smog in arid climate due to its volatile nature.’
    • ‘If there is a quantity of smoke or other airborne pollutant particles present, it is known as smog.’
    • ‘The rain has a way of cleaning the dust and smog out of the air making things appear especially vivid and clear.’
    • ‘As a source of smog and a severe global warming aggravator, coal is still king.’
    • ‘Since sunlight and heat are precursors of smog, the hot weather makes air pollution worse.’
    • ‘The clouds of smog and smoke did block out a good bit of the sun, meaning it shouldn't be too hot for travel.’
    • ‘Cars and trucks are major contributors to smog which is a serious health problem in Central and Eastern Canada.’
    • ‘People in Tanzania cook using firewood at home with smog around them.’
    • ‘The infamous London smog is an example of extreme air pollution.’
    • ‘In the Green, not the smell of cut grass and flowers, but rather the stink of traffic smog and semi stagnant water in the pond.’
    • ‘The Bay of Naples is still breathtaking if you can see it through the smog and the smoke from Vesuvio.’
    • ‘The size and shape of the various buildings can also affect wind patterns, causing perfect conditions for smog to occur.’
    • ‘As I look out of my window now, I see a layer of thick smog clinging to the buildings around the city.’
    • ‘He looked up at the sky, but the clouds and smog obstructed the view of the stars.’
    • ‘Lavanya cannot believe our clear atmosphere after London smog and fog, the huge horizon and the sunsets.’
    • ‘Mowing a lawn for half an hour with a gasoline engine makes as much smog as driving a new car 170 miles.’
    • ‘And when the heat has nowhere to go it reacts with pollutants, such as car fumes, to cause smog.’
    • ‘Exhaust fumes from cars and factories make for a toxic, suffocating smog that hangs over the city.’
    • ‘In the city the snow had long lost its Persil whiteness, and seemed bruised by the dirt and smog that seeps into everything here sooner or later.’
    exhaust fumes, fumes, smoke, pollution, gas
    fog, haze, vapour
    View synonyms


Early 20th century: blend of smoke and fog.