Industry

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  Navajo coal-powered electricity generating plant
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  Industrial air pollution
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  Le Havre
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  1942
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Bonfires

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  Midsummer festival bonfire in Denmark
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  "Smoke signal" by Frederic Remington

Urban fire

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  New Orleans, after Hurricane Katrina
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  Yekaterinburg
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  Wrangell, Alaska, 2914
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  Fire after Watts riots
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  Smoke from fire after Japan earthquake, 2011
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  Scrapyard

Burning cars

Wildfires

Volcanic eruptions

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  Mount St. Helens
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  Mount St. Helens
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  Mount Redoubt
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  Mayon Volcano
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  Mount Kanaga
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Other sources

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  from an incense
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  from a match
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  from charcoal starting
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  Special effects smoke
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  White smoke above the Sistine Chapel in 2005, signifying the election of Benedictus XVI
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  Smoke from a smoke bomb disrupts a polling station during a 2007 election in Russia
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  Steam locomotive, Pontrieux
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  Aerial smoke trails at the 2011 Radom Air Show
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  Aerial smoke trails, Italian acrobatics team
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  Duxford Air Festival
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  military tactic
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  Exhaust fumes from a truck on the road in South Africa
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  Incense smoke in Lhasa
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  Skywriting on Australia Day in 2008
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  Cigarette smoke
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  ship in Port of Le Havre