MADISON, Wis. -- Two people were hospitalized and the city's hazardous material team responded to the Madison Metropolitan Sewerage District on Monday morning after chlorine gas was accidentally released.

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Assistant Chief Engineer Mike Simon said that two chemicals were mistakenly mixed together at the Nine Springs Wastewater Treatment Plant, near the corner of South Towne Drive and Moorland Road, creating the chlorine release.

Blooming Grove fire officials said that a tractor-trailer driver was delivering a load of sodium hypochlorite to the location and a worker there made an error, loading the chemical into a holding bin full of ferrous chloride. The chemical reaction created a plume of chlorine gas, WISC-TV reported.

Both chemicals are used to treat waste water, but when mixed, they can create the sometimes deadly gas. Exposure to high amounts of chlorine gas can cause external and internal burning, respiratory problems and, in some severe cases, death.

Blooming Grove Assistant Fire Chief Jay Salvo said that the truck driver and plant worker were both exposed to the gas and had some breathing problems. They were decontaminated and transported to University of Wisconsin Hospital for precautionary measures but are doing fine, WISC-TV reported.

Salvo said the weather helped greatly with preventing the accident from endangering the public and clearing the scene in just a few hours.

"Because of the strong, 17 mph -- gusting to 30 -- westerly winds, the plume was dissipated very quickly," Salvo said. "So at no time was the public in any danger."

Although the public wasn't in harm's way, the incident did snarl traffic for hours as all roads leading to and around the treatment plant were closed to allow easy access to the site for emergency crews.

Authorities didn't evacuate anyone from area businesses or homes.

The Dane County Sheriff's Department had reopened the roadways shortly before noon.

Officials said that there wasn't any damage to any equipment at the treatment plant. The mixing of these chemicals can cause extreme heat and can burn through storage silos, officials said.

The city's hazmat team monitored air quality as well as the heat that was coming off the chemical reaction. Crews said that the temperature were back to their normal levels when the team left shortly after noon.

Stay tuned to WISC-TV and Channel 3000 for continuing coverage.