[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 licenseIndustrial Construction Engineer Pollution https://www.rawpixel.com/image/90990/free-photo-image-factory-business-chemicalView licenseFreight cars in flour mill district. Minneapolis, Minnesota. Sourced from the Library of Congress. https://www.rawpixel.com/image/12282567/photo-image-cloud-person-skyFree Image from public domain 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 license[Untitled photo, possibly related to: Railroad yards. Conway, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12283559/photo-image-steam-sky-smokeFree Image from public domain licenseAt the steel plant in Midland, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277719/photo-image-plant-person-smokeFree Image from public domain licenseHouses and Pittsburgh Crucible Steel Company in Midland, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277806/photo-image-sky-smoke-mountainFree 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 licenseRecycle Reuse Eco Friendly Green Business Concept https://www.rawpixel.com/image/838426/free-image-rawpixelView 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 licenseGeneral view of Shelton, Connecticut, with Derby, Connecticut, in the distance. Sourced from the Library of Congress. https://www.rawpixel.com/image/12279122/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 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 licenseRecycle Reuse Eco Friendly Green Business Concept https://www.rawpixel.com/image/913614/free-image-rawpixelcomView 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 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 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 licenseRecycle Reuse Eco Friendly Green Business Concept https://www.rawpixel.com/image/884301/free-image-rawpixelcomView license[Untitled photo, possibly related to: Columbia Steel Company at Ironton, Utah. Discharging coke oven]. Sourced from the… https://www.rawpixel.com/image/12298019/photo-image-person-sky-smokeFree Image from public domain licenseCity dump. Dubuque, Iowa. In the background are shacks occupied by men who salvage anything marketable they can find in the… https://www.rawpixel.com/image/12283102/photo-image-background-person-skyFree Image from public domain license[Untitled photo, possibly related to: Loading grain boat. Duluth, Minnesota]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12285261/photo-image-sky-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: Steelworkers going home at the end of the afternoon shift. A union official is… https://www.rawpixel.com/image/12278732/photo-image-people-smoke-public-domainFree Image from public domain licenseA textile mill and company houses in Uncasville, Connecticut. Sourced from the Library of Congress. https://www.rawpixel.com/image/12278939/photo-image-person-sky-public-domainFree 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/12278757/photo-image-background-person-skyFree Image from public domain licenseSkyline, midtown Manhattan, New York City. Sourced from the Library of Congress. https://www.rawpixel.com/image/12270296/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Main street in Woodville, Greene County, Georgia]. Sourced from the Library of… https://www.rawpixel.com/image/12278763/photo-image-cloud-person-skyFree Image from public domain license[Untitled photo, possibly related to: A freighter pulling into New York Harbor]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12264375/photo-image-sky-smoke-animalFree Image from public domain license