Spoiler
Vermont has the lowest level of pollution and Louisiana has the worst level according to US News.
State Pollution Rankings | US News Best States
Vermont
New Hampshire
South Dakota
New Mexico
Wyoming
California
Rhode Island
Maine
Colorado
Idaho
New York
Nebraska
Hawaii
Minnesota
Montana
Maryland
Massachusetts
Washington
North Dakota
Wisconsin
Arizona
Oklahoma
Kansas
Missouri
Iowa
Georgia
Florida
Mississippi
Alaska
Connecticut
North Carolina
Virginia
South Carolina
Michigan
Kentucky
Arkansas
West Virginia
New Jersey
Pennsylvania
Texas
Alabama
Illinois
Tennessee
Oregon
Ohio
Utah
Delaware
Indiana
Nevada
Louisiana
I am surprised South Dakota is so low. I guess not having any real industry and mining being long gone is going to outweigh having a Libertarian government that refuses to regulate anything.
See this comment - https://hexbear.net/post/220995/comment/2813130