- Salt Lake City’s efforts to fight pollution face a new challenge: Toxic dust - Declining water levels exposed much of the Great Salt Lake's bed and created conditions for storms of dust laden with toxic metals that now threaten 2 million people. https://www.nbcnews.com/science/environment/salt-lake-citys-efforts-fight-pollution-face-new-challenge-toxic-dust-rcna44508 8 comments environment