December 2019 that they would idle most of its operations in the area, including all of its operations on Zug Island, by April 2020. Wildlife Despite the island's extremely developed industrial landscape, areas along the south and west shores are left undeveloped to provide habitat for wildlife. Foxes and once-endangered peregrine falcons, which frequent large outdoor structures such as the gantry cranes at the ore docks, thrive on the island and offshore. At the bottom of the Detroit River is a man-made bed of coal cinders which serves as a rare spawning site for lake sturgeon, a threatened species. Less desirable are the sizable and sometimes troublesome populations of gulls, feral cats and rats. Environmental impact One of the most pressing problems in the neighborhoods surrounding Zug Island is poor air quality. According to an article in the January 20, 2010, edition of the Detroit Free Press, the neighborhoods around the area compose six of the ten most polluted zip codes in Michigan. In the article, residents cite air quality samples containing lead and high levels of methyl ethyl ketone, large numbers of cancer and asthma cases, and foul smells with "sparkly" dust that must be removed with toilet cleaner. Interviewed separately, residents of the area say the foul smells are strong enough to cause dry heaves. Noise and vibration In 2011, the Zug Island area was identified by Canadian scientists and Ontario's Ministry of Natural Resources as the source of mysterious rumblings and vibrations, known as "The Hum", that have plagued hundreds of area residents with cyclical vibrations reportedly being felt in the ground up to fifty miles (eighty kilometres) away. The city of River Rouge reported in the Star that it cannot afford to spend any more money on investigating the hum. They claim the City Council had already spent over $1 million to help Windsor and Ontario find the source of the noise. However, they say it likely comes from the steel mill facilities on the island. , a Canadian scientist is using sound-level meters and a portable "pentangular array" of cameras and microphones to try to accurately identify the source of the sound, in order to know whom exactly to ask to fix it. The results of the 2013 study were released on May 23, 2014. Although contemporaneous news reports claim the study confirmed that Zug Island was the source of the hum, the report's findings