Reports began flowing in from across Harris County on Thursday afternoon, according to several agencies.
On social media, the Channelview Fire Department said it was aware of the smell and was actively investigating the source, adding that CenterPoint was also looking into it.
Harris County Constable Precinct 4 Mark Herman said that areas like Champions, Cypress, Vintage Park, Tomball, and Spring in northwest Harris County and areas like Pasadena, Kingwood, and east Houston, all in east Harris County, were reporting the odor.
Earlier on Thursday, Lone Star College - Houston North Fallbrook in north Harris County reported that it evacuated the building after reports of a gas odor, but investigators declared an all-clear less than 15 minutes later.
The Harris County Fire Marshal's Office said it received several reports of gas odors, but couldn't find a source. Eyewitness News reached out to the county's Pollution Control team and is awaiting a response.