Cement kiln dust (CKD) is a byproduct of the cement manufacturing process. It’s produced at Dowe Flats, and disposed of at the plant on the south side of Highway 66. CKD contains several heavy metals, including arsenic, lead, chromium, cadmium and molybdenum, and has “been known to precede a number of systemic injuries with particular reference to the respiratory, gastrointestinal, and integumentary systems characterized by fibrosis, emphysema, cough, cancer, inflammation, and liver diseases among workers and host community residents of cement factories”. (Source)