The police department in the town east of Houston said the fire department is investigating the scent in the air Wednesday morning.
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They were informed that an industrial facility lost power and had a release, police said.
They added air monitoring showed no detectable levels.
It was not immediately known which facility experienced the power loss.
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Mont Belvieu's city limits are shared between Chambers and Liberty counties, with the former holding the majority of the town in its westernmost portion.
A 2019 Census estimation showed its population at 6,574 people.
In southeast Texas, odors are basically the norm in a region that's home to oil refineries. The video above alludes to a similar incident of an overwhelming smell that puzzled residents elsewhere in the Houston area.