[Untitled photo, possibly related to: Traffic on the main street of Fayetteville, North Carolina at about five o'clock, when… https://www.rawpixel.com/image/12277619/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Jones Laughlin steel company. Pittsburgh, Pennsylvania]. Sourced from the Library of… https://www.rawpixel.com/image/12285960/photo-image-cloud-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: The Bessemers "blooming" at the Jones and Laughlin Steel Company in Aliquippa… https://www.rawpixel.com/image/12262610/photo-image-person-sky-smokeFree Image from public domain licenseIn the roundhouse at Proviso Yard, Chicago and Northwestern Railroad. Chicago, Illinois. Sourced from the Library of… https://www.rawpixel.com/image/12291046/photo-image-person-smoke-public-domainFree Image from public domain licenseAir pollution background https://www.rawpixel.com/image/11560045/air-pollution-backgroundView license[Untitled photo, possibly related to: Washington, D.C. Rock Creek Parkway during the construction]. Sourced from the Library… https://www.rawpixel.com/image/12260345/photo-image-person-horse-smokeFree Image from public domain licenseRadio City, New York City (Rockefeller Center). Sourced from the Library of Congress. https://www.rawpixel.com/image/12270991/photo-image-smoke-road-public-domainFree Image from public domain license[Untitled photo, possibly related to: Snow in downtown Providence, Rhode Island]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12263648/photo-image-person-sky-smokeFree Image from public domain licenseMen going home from work at the steel mill in Midland, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12278004/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/12283215/photo-image-smoke-public-domain-factoryFree Image from public domain licenseCincinnati, Ohio. View of the city across the Ohio river. Sourced from the Library of Congress. https://www.rawpixel.com/image/12296952/photo-image-cloud-frame-plantFree Image from public domain licenseStreet in New Bedford at night during a fog. New Bedford, Massachusetts. Sourced from the Library of Congress. https://www.rawpixel.com/image/12278955/photo-image-smoke-light-roadFree Image from public domain licenseNew York City, foggy morning at Fulton fish market. Sourced from the Library of Congress. https://www.rawpixel.com/image/12294733/photo-image-sky-smoke-public-domainFree Image from public domain licenseBurning the autumn leaves on Broadway in Norwich, Connecticut. Sourced from the Library of Congress. https://www.rawpixel.com/image/12278302/photo-image-plant-person-leavesFree Image from public domain licenseFactories and mills in the industrial city of Waterbury, Connecticut. Sourced from the Library of Congress. https://www.rawpixel.com/image/12275989/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Argentine, Kansas. Night view of the Atchison, Topeka, and Santa Fe Railroad shops and… https://www.rawpixel.com/image/12291458/photo-image-smoke-light-public-domainFree Image from public domain license[Untitled photo, possibly related to: Jones Laughlin steel company, on both sides of the river. Pittsburgh, Pennsylvania].… https://www.rawpixel.com/image/12287359/photo-image-cloud-plant-skyFree Image from public domain licenseAir pollution phone wallpaper https://www.rawpixel.com/image/11560048/air-pollution-phone-wallpaperView licenseNew York, New York. Late evening on the lower East Side. Sourced from the Library of Congress. https://www.rawpixel.com/image/12293184/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Summit (vicinity), California. Going down the mountains on the Atchison, Topeka, and… https://www.rawpixel.com/image/12293820/photo-image-cloud-sky-smokeFree Image from public domain licenseMountain Sky Clouds Scenery Landscape Beautiful https://www.rawpixel.com/image/90708/free-photo-image-adventure-amazing-areaView licenseWoman Rear View Top Mountain Carefree Cloudscape Concept https://www.rawpixel.com/image/15607/premium-photo-image-activity-adventure-arms-outstretchedView license[Untitled photo, possibly related to: West Aliquippa, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12284990/photo-image-person-sky-smokeFree Image from public domain licenseChicago, Illinois. In the train concourse at the Union Station. Sourced from the Library of Congress. https://www.rawpixel.com/image/12290939/photo-image-person-smoke-public-domainFree Image from public domain licenseWoman Smiling Mountain Carefree Cloudscape Concept https://www.rawpixel.com/image/15551/premium-photo-image-activity-adventure-calmView licenseGoing home from work at the steel mill in Midland, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12278729/photo-image-person-smoke-roadFree Image from public domain licenseArgentine, Kansas. Night view of the Atchison, Topeka, and Santa Fe Railroad shops and roundhouse. Sourced from the Library… https://www.rawpixel.com/image/12291200/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Opening milk cans at the United Farmers Coop Creamery in East Berkshire, Vermont].… https://www.rawpixel.com/image/12262984/photo-image-plant-person-smokeFree Image from public domain licenseSilhouette Business People Commuter Walking Rush Hour Concept https://www.rawpixel.com/image/120622/premium-photo-image-abstract-building-businessView licenseWoman Rear View Top Mountain Carefree Cloudscape Concept https://www.rawpixel.com/image/15463/premium-photo-image-activity-adventure-calmView licenseFriends exploring and enjoying nature shoot https://www.rawpixel.com/image/15435/premium-photo-image-activity-adventure-calmView licenseSilhouette Meeting Table Office Room Window Indoor Concept https://www.rawpixel.com/image/120534/image-rawpixelcomView licenseBethlehem-Fairfield shipyards, Baltimore, Maryland. Lifting an after peak section. Sourced from the Library of Congress. https://www.rawpixel.com/image/12292938/photo-image-person-sky-lightFree Image from public domain licenseAir pollution blog banner https://www.rawpixel.com/image/11560052/air-pollution-blog-bannerView licenseChicago, Illinois. Waiting for trains in the concourse of the Union Station. Sourced from the Library of Congress. https://www.rawpixel.com/image/12290770/photo-image-person-smoke-roadFree Image from public domain licenseFriends exploring and enjoying nature shoot https://www.rawpixel.com/image/15371/premium-photo-image-activity-adventure-calmView licenseWoman Smiling Mountain Carefree Cloudscape Concept https://www.rawpixel.com/image/15283/premium-photo-image-activity-adventure-calmView licenseMan Rear View Top Mountain Carefree Cloudscape Concept https://www.rawpixel.com/image/15243/premium-photo-image-activity-adventure-calmView license[Untitled photo, possibly related to: New York, New York. Times Square on a rainy day]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12293732/photo-image-person-sky-smokeFree Image from public domain licenseU.S. 1 turnoff to Baltimore or Annapolis, Maryland. Sourced from the Library of Congress. https://www.rawpixel.com/image/12268905/photo-image-plant-person-skyFree Image from public domain license[Untitled photo, possibly related to: Presidential Range from Bear Notch Road, New Hampshire]. Sourced from the Library of… https://www.rawpixel.com/image/12258035/photo-image-cloud-plant-skyFree Image from public domain licenseJones Laughlin steel company, on both sides of the river. Pittsburgh, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12285927/photo-image-cloud-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Sebago Lake flooding highway, Maine]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12257928/photo-image-plant-sky-treeFree Image from public domain licenseWashington, D.C., in front of Union Station.. Sourced from the Library of Congress. https://www.rawpixel.com/image/12295510/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Caples, West Virginia. With coal mine tipple in foreground]. Sourced from the Library… https://www.rawpixel.com/image/12247927/photo-image-plant-sky-forestFree Image from public domain licenseAir pollution background https://www.rawpixel.com/image/11560044/air-pollution-backgroundView licenseCars of steelworkers leaving the mill in Midland, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277817/photo-image-person-smoke-lightFree Image from public domain licenseA foggy night in New Bedford, Massachusetts. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277776/photo-image-person-sky-smokeFree Image from public domain licenseScenes of the northern Shenandoah Valley, including the Resettlement Administration's Shenandoah Homesteads. Sourced from… https://www.rawpixel.com/image/12258180/photo-image-face-people-shirtFree Image from public domain licenseLoveland Pass, Colorado. The road leading to the pass. Sourced from the Library of Congress. https://www.rawpixel.com/image/12297546/photo-image-cloud-moon-skyFree Image from public domain license[Untitled photo, possibly related to: At the steel plant in Midland, Pennsylvania]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12278036/photo-image-face-plant-personFree Image from public domain licenseThe donkey engine transporting logs from woods to yard, Long Bell Lumber Company, Cowlitz County, Washington by Russell Lee https://www.rawpixel.com/image/12173145/image-plant-people-artFree Image from public domain licenseRiver Rouge Plant of Henry Ford. Dearborn, Michigan. Sourced from the Library of Congress. https://www.rawpixel.com/image/12286432/photo-image-plant-person-skyFree Image from public domain license[Untitled photo, possibly related to: Argonis, Kansas. Crossing wheat fields along the Atchison, Topeka, and Santa Fe… https://www.rawpixel.com/image/12291231/photo-image-cloud-sky-smokeFree Image from public domain licenseLighthouse on Buzzard's Bay, Mattapoisett, Massachusetts. Sourced from the Library of Congress. https://www.rawpixel.com/image/12261639/photo-image-cloud-plant-personFree Image from public domain license[Untitled photo, possibly related to: Chicago, Illinois. Engines lined up at coaling station at an Illinois Central Railroad… https://www.rawpixel.com/image/12290655/photo-image-cloud-smoke-public-domainFree Image from public domain license[Untitled photo, possibly related to: Street scene, Manchester, New Hampshire]. Sourced from the Library of Congress. https://www.rawpixel.com/image/12254456/photo-image-sky-smoke-roadFree Image from public domain licenseMiners on their way underground, 7 a.m. Old Ben number eight. West Frankfort, Illinois. See 26940-D. Sourced from the… https://www.rawpixel.com/image/12272680/photo-image-person-sky-smokeFree Image from public domain licenseAir pollution background https://www.rawpixel.com/image/11560050/air-pollution-backgroundView license[Untitled photo, possibly related to: Argentine, Kansas. Freight train about to leave the Atchison, Topeka, and Santa Fe… https://www.rawpixel.com/image/12291489/photo-image-person-smoke-lightFree Image from public domain license[Untitled photo, possibly related to: The Bessemers "blooming" at the Jones and Laughlin Steel Company in Aliquippa… https://www.rawpixel.com/image/12263543/photo-image-person-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: In the mill district of Pittsburgh, Pennsylvania]. Sourced from the Library of… https://www.rawpixel.com/image/12278605/photo-image-sky-smoke-mountainFree Image from public domain licenseWheat stubble burning. Because of above-normal rainfall this season, the wheat developed more straw, and the fire hazard… https://www.rawpixel.com/image/12151496/image-plant-grass-artFree Image from public domain license