Skyline, midtown Manhattan, New York City. Sourced from the Library of Congress. https://www.rawpixel.com/image/12270382/photo-image-sky-smoke-public-domainFree Image from public domain licenseChicago, Illinois. An unusually heavy fog in the early afternoon. Sourced from the Library of Congress. https://www.rawpixel.com/image/12288509/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Abandoned tile factory, Parke County, Indiana]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12252610/photo-image-person-smoke-treeFree Image from public domain licenseBusiness People Talking Connection Conversation Concept https://www.rawpixel.com/image/116584/image-rawpixelcomView licenseBusiness People Commuter City Life Walking Concept https://www.rawpixel.com/image/120677/premium-photo-image-urban-sky-abstract-back-litView licenseBusiness People Talking Connection Conversation Concept https://www.rawpixel.com/image/116520/image-rawpixelcomView licenseSilhouette Meeting Table Office Room Window Indoor Concept https://www.rawpixel.com/image/120545/image-rawpixelcomView license[Untitled photo, possibly related to: Phelps Dodge refining company, El Paso, Texas. Sheets of pure copper, which had been… https://www.rawpixel.com/image/12295536/photo-image-person-smoke-public-domainFree Image from public domain licenseNew York, New York. Skyline of midtown Manhattan. Sourced from the Library of Congress. https://www.rawpixel.com/image/12270177/photo-image-sky-smoke-public-domainFree Image from public domain licenseWoman Smiling Mountain Carefree Cloudscape Concept https://www.rawpixel.com/image/15302/premium-photo-image-activity-adventure-calmView licenseAir pollution background https://www.rawpixel.com/image/11560047/air-pollution-backgroundView license[Untitled photo, possibly related to: West Aliquippa, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283511/photo-image-sky-smoke-lightFree Image from public domain licenseWoman Smiling Mountain Carefree Cloudscape Concept https://www.rawpixel.com/image/15226/premium-photo-image-activity-adventure-calmView licenseAir pollution background https://www.rawpixel.com/image/11560046/air-pollution-backgroundView license[Untitled photo, possibly related to: Opening milk cans at the United Farmers Coop Creamery in East Berkshire, Vermont].… https://www.rawpixel.com/image/12262861/photo-image-plant-smoke-treeFree Image from public domain licenseA section of West Aliquippa, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277784/photo-image-sky-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: Chicago, Illinois. In the roundhouse at a Chicago and Northwestern Railroad yard].… https://www.rawpixel.com/image/12289934/photo-image-smoke-light-roadFree Image from public domain license[Untitled photo, possibly related to: Skyline, midtown Manhattan, New York City]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12270334/photo-image-sky-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: New York, New York. Concourse at the Pennsylvania railroad station]. Sourced from the… https://www.rawpixel.com/image/12288565/photo-image-person-smoke-public-domainFree Image from public domain licenseNew York, New York. Skyline of midtown Manhattan. Sourced from the Library of Congress. https://www.rawpixel.com/image/12271223/photo-image-sky-smoke-public-domainFree Image from public domain licenseMountain Panorama Hill Scenic Hong Kong https://www.rawpixel.com/image/91438/free-photo-image-hong-kong-asia-buildingView license[Untitled photo, possibly related to: Charleston, West Virginia. Part of the Union Carbon and Carbide Chemicals Corporation… https://www.rawpixel.com/image/12248173/photo-image-plant-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Skyline, midtown Manhattan, New York City]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12270983/photo-image-sky-smoke-public-domainFree Image from public domain licenseChicago, Illinois. In the roundhouse at a Chicago and Northwestern Railroad yard. Sourced from the Library of Congress. https://www.rawpixel.com/image/12290240/photo-image-person-smoke-lightFree Image from public domain licenseNew York, New York. Concourse at the Pennsylvania railroad station. Sourced from the Library of Congress. https://www.rawpixel.com/image/12288705/photo-image-person-smoke-roadFree Image from public domain license[Untitled photo, possibly related to: Dubuque, Iowa. The smoke comes from Dubuque's largest industry, the sash and door… https://www.rawpixel.com/image/12282546/photo-image-cloud-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Pittsburgh, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283216/photo-image-sky-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: View taken from train en route to Forrest City, Arkansas from Memphis, Tennessee… https://www.rawpixel.com/image/12252239/photo-image-frame-plant-skyFree Image from public domain license[Untitled photo, possibly related to: Washington, D.C. Government workers lunching near the Washington Monument]. Sourced… https://www.rawpixel.com/image/12289258/photo-image-plant-person-grassFree Image from public domain licenseChicago, Illinois. An unusually heavy fog in the early afternoon. Sourced from the Library of Congress. https://www.rawpixel.com/image/12288551/photo-image-person-smoke-roadFree Image from public domain license[Untitled photo, possibly related to: Chicago, Illinois. An unusually heavy fog in the early afternoon]. Sourced from the… https://www.rawpixel.com/image/12290231/photo-image-person-smoke-lightFree Image from public domain license[Untitled photo, possibly related to: Scene in west Aliquippa, Pennsylvania. Stacks of the Jones and Laughlin Steel… https://www.rawpixel.com/image/12277958/photo-image-background-person-smokeFree Image from public domain licenseCoal barges on the river. Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12287374/photo-image-cloud-sky-smokeFree Image from public domain licenseNew York, New York. Evening in Washington Square. Sourced from the Library of Congress. https://www.rawpixel.com/image/12269625/photo-image-plant-person-skyFree Image from public domain licenseCityscape Downtown River Development View Scenic https://www.rawpixel.com/image/90998/free-photo-image-landscape-cityscape-architectureView licenseNew York, New York. Looking west at the Third Avenue elevated railway on 14th Street at 7 a.m.. Sourced from the Library of… https://www.rawpixel.com/image/12289635/photo-image-person-sky-smokeFree Image from public domain licenseMilitary training in high school. Omaha, Nebraska. Sourced from the Library of Congress. https://www.rawpixel.com/image/12267948/photo-image-person-sky-smokeFree Image from public domain licenseFreight yards into Aliquippa, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12284650/photo-image-person-sky-smokeFree Image from public domain licenseChicago, Illinois. An unusually heavy fog in the early afternoon. Sourced from the Library of Congress. https://www.rawpixel.com/image/12288516/photo-image-person-smoke-roadFree Image from public domain licensePittsburgh, Pennsylvania. Jones and Laughlin steelworks. Sourced from the Library of Congress. https://www.rawpixel.com/image/12285879/photo-image-plant-sky-smokeFree Image from public domain licenseBusiness People Commuter City Life Walking Concept https://www.rawpixel.com/image/120848/premium-photo-image-abstract-back-lit-buildingsView license[Untitled photo, possibly related to: Long stairway in mill district of Pittsburgh, Pennsylvania]. Sourced from the Library… https://www.rawpixel.com/image/12277835/photo-image-person-sky-smokeFree Image from public domain licenseAutos have to turn on lights to penetrate gloom of dust storm. Amarillo, Texas. Sourced from the Library of Congress. https://www.rawpixel.com/image/12265937/photo-image-plant-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Parking lot. Chicago, Illinois]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12259615/photo-image-sky-smoke-public-domainFree Image from public domain licenseHouses and steel mill in Aliquippa, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277736/photo-image-sky-smoke-public-domainFree Image from public domain licenseBusiness People Talking Connection Conversation Concept https://www.rawpixel.com/image/116595/image-rawpixelcomView licenseFriends exploring and enjoying nature shoot https://www.rawpixel.com/image/15533/premium-photo-image-activity-adventure-calmView licenseStreet in the mill district in Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277940/photo-image-person-smoke-treeFree Image from public domain licenseBusiness People Talking Connection Conversation Concept https://www.rawpixel.com/image/116519/image-rawpixelcomView licenseWoman Smiling Mountain Carefree Cloudscape Concept https://www.rawpixel.com/image/15461/premium-photo-image-activity-adventure-calmView licenseSilhouette Meeting Table Office Room Window Indoor Concept https://www.rawpixel.com/image/120544/image-rawpixelcomView license[Untitled photo, possibly related to: Washington, D.C. A view of 14th Street showing street cars, buses, taxicabs, and… https://www.rawpixel.com/image/12260479/photo-image-person-sky-smokeFree Image from public domain licenseAir pollution desktop wallpaper https://www.rawpixel.com/image/11560049/air-pollution-desktop-wallpaperView license[Untitled photo, possibly related to: Snow in downtown Providence, Rhode Island]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12262750/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Pittsburgh, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12284356/photo-image-sky-smoke-public-domainFree Image from public domain licenseAmbridge, Pennsylvania. View of houses and steel mills. Sourced from the Library of Congress. https://www.rawpixel.com/image/12272256/photo-image-person-sky-smokeFree Image from public domain licenseHouses and steel mills in Aliquippa, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12278005/photo-image-sky-smoke-public-domainFree Image from public domain licenseWashington, D.C. -Hugh and Lynn Massman sightseeing on their first day in Washington. Their baby is being taken care of in… https://www.rawpixel.com/image/12295521/photo-image-plant-person-skyFree Image from public domain licenseNew York, New York. A scene in the Fulton fish market. Sourced from the Library of Congress. https://www.rawpixel.com/image/12294686/photo-image-person-sky-smokeFree Image from public domain licenseNew York, New York. Saint Mark's Place and the Bowery at midnight. Sourced from the Library of Congress. https://www.rawpixel.com/image/12288534/photo-image-person-smoke-roadFree Image from public domain license[Untitled photo, possibly related to: Pittsburgh, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12284472/photo-image-cloud-sky-smokeFree Image from public domain licenseBusiness Professional Communication Office Cityscape Concept https://www.rawpixel.com/image/117418/premium-photo-image-brainstorming-building-businessView license[Untitled photo, possibly related to: Jones and Laughlin steel company. Pittsburgh, Pennsylvania]. Sourced from the Library… https://www.rawpixel.com/image/12287382/photo-image-sky-smoke-lightFree Image from public domain licenseAir pollution background https://www.rawpixel.com/image/11560051/air-pollution-backgroundView licenseGoing to mass. Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283209/photo-image-person-smoke-lightFree Image from public domain license[Untitled photo, possibly related to: Going home from work at the steel mill in Midland, Pennsylvania]. Sourced from the… https://www.rawpixel.com/image/12277809/photo-image-person-smoke-roadFree Image from public domain license[Untitled photo, possibly related to: Pittsburgh, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283476/photo-image-cloud-sky-smokeFree Image from public domain licenseWashington, D.C. A street scene, probably 14th Street, showing automobile and street car traffic. The People's Life… https://www.rawpixel.com/image/12260344/photo-image-background-person-skyFree Image from public domain licenseDubuque, Iowa. Smoke from sash and door mills. Sourced from the Library of Congress. https://www.rawpixel.com/image/12282851/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: General view of mills in Lawrence, Massachusetts]. Sourced from the Library of… https://www.rawpixel.com/image/12279504/photo-image-sky-smoke-lightFree Image from public domain licenseBusiness People Meeting Discussion Communication Concept https://www.rawpixel.com/image/118589/premium-photo-image-administration-back-lit-boardroomView licenseDust storm. Note heavy metal signs blown out by wind. Amarillo, Texas. Sourced from the Library of Congress. https://www.rawpixel.com/image/12251087/image-cloud-person-skyFree Image from public domain licenseBusiness People Meeting Commuter Greeting Handshake Concept https://www.rawpixel.com/image/115799/premium-photo-image-back-lit-brainstorming-buildingView license[Untitled photo, possibly related to: Old miner on donkey, still quite a common means of transportation, in county road near… https://www.rawpixel.com/image/12247776/photo-image-plant-person-horseFree Image from public domain license[Untitled photo, possibly related to: Phelps Dodge refining company, El Paso, Texas. Sheets of pure copper, which had been… https://www.rawpixel.com/image/12295792/photo-image-person-smoke-public-domainFree Image from public domain licenseChicago, Illinois. An unusually heavy fog in the early afternoon. Sourced from the Library of Congress. https://www.rawpixel.com/image/12288505/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Sunday morning. Pittsburgh, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283513/photo-image-person-smoke-lightFree Image from public domain licenseView of city of Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12272448/photo-image-sky-public-domain-natureFree Image from public domain licenseNew York, New York. Grumman Wildcat airplane exhibited at Columbus Circle for bond selling purposes. Sourced from the… https://www.rawpixel.com/image/12289900/photo-image-people-smoke-airplaneFree Image from public domain licenseBurning the autumn leaves on Broadway. Norwich, Connecticut. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277993/photo-image-plant-person-skyFree Image from public domain license