Washtenaw County Hazardous Materials Response Team air monitoring equipment did not detect flammable vapors or “volatile organic compounds,” officials said.

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

Fire crews said a hazmat situation that prompted the evacuation of everyone 300 feet around a Southfield hotel Wednesday was caused by fumes from a box of hair dye.

The area was reopened just before 2 p.m. Wednesday when authorities said the caustic chemical smell was revealed to be hair dye.

The mystery behind a Macomb County creek turning neon green has been solved.

MADISON HEIGHTS, Mich. – Test results confirm a green substance found seeping onto I-696 in Madison Heights last week is hexavalent chromium. The substance was discovered on the eastbound side of the roadway, near the Couzens Road exit, on Dec. 20. Hexavalent chromium was found at at 0.14 milligrams per liter. The storm sewer eventually enters Lake St. Clair miles away, EGLE said. According to EGLE, the “release likely contributed contaminants to the storm sewer system before it was discovered.”The cleanup could take months, officials said.

MADISON HEIGHTS, Mich. – One eastbound lane of I-696 is closed in Madison Heights due to a substance on the freeway. MORE: Green substance from condemned Madison Heights business oozes onto I-696The shoulder and exit ramp to Couzens Road are also closed. The Sky 4 chopper showed the green substance oozing out of an embankment. The substance is believed to be contaminated ground water that is coming from the basement of Electro Plating Services, the Michigan Dept. The owner of the business was recently sentenced after he pleaded guilty to storing hazardous waste without a permit.