Pollution meters were used to warn the user against all forms of air pollution and radiation. In 2099, Judge Joe Dredd used one to identify a 20th century petrol-burning car as being in violation of Mega-City One's anti-pollution laws, leading to the immediate destruction of the offending vehicle. In the years after the Apocalypse War it was even more useful as parts of the city had become radioactive. In 2105 / 2106, contraband Pollution meters could be purchased for 100 creds.