AIR POLLUTION: Special coating for roof tiles could cleanse smoggy skies -- study Amanda Peterka, E&E reporter Published: Monday, June 9, 2014 A California research team has created a coating for roof tiles that attacks pollutants linked to urban smog. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.