Residents living near the Stellantis Mack Assembly Plant in Detroit have been complaining about a foul smell. Now the company plans to hire an outside firm to investigate the cause, but it could take 90 days to complete the investigation.

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Officials said the city plans to use firefighting form to suppress the vapors found within the sanitary system. The industrial facility has taken measures, including inserting plugs into the onsite sewer system to prevent it from entering the system at a location north of Gibraltar Road at the Ford Flat Rock Assembly Plant property.

As of Friday morning, seven homes have been evacuated and hundreds of environmental safety investigators are in the area.

Federal and state hazardous materials teams from Downriver and western Wayne County went street-by-street and door-to-door Thursday in Flat Rock’s southeast neighborhoods.

An unusual smell Downriver sparked an investigation from hazmat teams Thursday, along with state and federal environmental agencies.

One of the strangest symptoms of COVID is the loss of taste and smell. Some people have discovered that when their senses return they’ve been altered.

Two University of Michigan professors partnered with the 'nose of Ann Arbor' to bring students innovative, scent-based programming.

“Normally, I wear perfume and like for things to smell nice. “You haven’t completely lost your sense of smell but nor is it good.”He sent her away with homework: six months of olfactory rehab. “The sense of smell is a sense that is fundamentally forgotten," Galouye said. The Nice researchers are exploring whether olfactory complaints are linked to COVID-related cognitive difficulties, including problems with concentrating. “But when you lose the sense of smell, you realize how truly lucky we are to be able to smell these things.”___Follow AP’s pandemic coverage at https://apnews.com/hub/coronavirus-pandemic, https://apnews.com/hub/coronavirus-vaccine and https://apnews.com/UnderstandingtheOutbreak

A new study out of the U.K. finds that loss of smell or taste is a “highly reliable” indicator that someone has contracted COVID-19. But after contracting COVID-19, Fletcher experienced difficulty breathing, abdominal pain and lost his sense of smell and taste. According to Justin Turner, a doctor and medical director of Vanderbilt University’s Smell and Taste Center, about 50%-70% of patients with COVID-19 will lose part or all of their sense of smell and/or taste. Turner says for up to 25% of COVID-19 patients, the loss of smell and taste could be the first -- and sometimes only -- sign of infection. The loss of smell and taste can linger for months following a COVID-19 infection; it’s often the last symptom to resolve.