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ST. LOUIS (KTVI) – Maybe you’ve seen and smelled it, but it’s running area fire departments all around St. Louis. The smoky haze has residents from South St. Louis to Jefferson County, and central St. Louis County calling area fire departments.

Fire departments have been out since 8:30 pm looking for the source of the smell and haze.

So far, no one has an answer for the mysterious odor and haze.

Over the last 90 minutes we've investigated all reports of smoke/haze in the area; no source located. #STLSmokeSmell #STLSMOKE — St. Louis Fire Dept (@STLFireDept) March 22, 2016

Companies actively investigating multiple reports of smoke in various locations throughout the city. #STLCity pic.twitter.com/CVCZ3VIQD4 — St. Louis Fire Dept (@STLFireDept) March 22, 2016

If you think you're smelling the #STLSmokeSmell in Arnold, I can assure you that's just what Arnold smells like. — Angela Smith (@angelamarie85) March 22, 2016

Smelled the #stlsmokesmell when I left church in Overland and it followed me all the way to Affton. — Chris Cervantes (@cjcervantes85) March 22, 2016

Reading Twitter, the smoke is evident from Hillsboro to U City. If this is a controlled burn, they got some 'splaining to do. #stlsmokesmell — Jeff Griswold (@sparkygriz) March 22, 2016