Chicago Mayor Rahm Emanuel and Illinois Attorney General Lisa Madigan today announced an agreement with a Hammond firm over "petcoke" and “met coke”. The company is being required to remove piles of the powdery materials from their facility on the southeast side of Chicago. Petcoke is a byproduct of petroleum refining, and met coke is metallurgical coke dust. Officials say they're trying to prevent petcoke from being carried by winds into nearby neighborhoods. Two weeks ago, the city of Chicago launched a campaign asking residents to report sightings of petcoke dust. Officials say inhaling the dust can contribute to respiratory health problems. Chicago is also considering new regulations requiring petcoke to be stored indoors.