Pollutionwatch: how lessons from 1920s were forgotten for 50 years

A century ago John Switzer Owens discovered how far pollution could travel, but his research was ignoredIn August 1921, John Switzer Owens had a UK holiday. He went to Holme, Norfolk, and took his latest invention with him. Each day he took his device to the beach to sample the air. He also flung thistledown into the sky and noted its passage over the sand to understand where the wind came from.When the wind came from Germany’s industrial Ruhr, it became hazy and particle pollution soared.