WORCESTER, Mass. (WHDH) — Crews investigated a chemical danger at a 15-unit apartment building on Nutall Lane in Worcester Wednesday.

People in the building were evacuated after they complained of a foul odor coming from an apartment.

Brianna Grady is pregnant and was forced out in the 90 degree heat over a chemical concern inside her building.

“You could smell it on the front step it was that bad. I just couldn’t believe it,” said Grady.

Hazardous materials crews were called to the scene and found high levels of hydrogen sulfide. They also found a woman lying on a bed. She was barely breathing. Officials believe it was a suicide attempt because a note was found on the outside of her bedroom. She was rushed to the hospital. There is no word on her condition.

“There was a caution sign on the door, stating that caution: Hydrogen sulfide. Immediately backed out because of the readings and called for a state hazmat response,” said Dep. Chief Geoffrey Gardell of the Worcester Fire Department.

Authorities also told neighbors, including seniors at a nearby nursing home, to close their windows and turn off their air condition. They didn’t want anyone to inhale the deadly gas.

“[Hydrogen sulfide] is a very lethal gas — usually one or two whiffs gets ‘em. They go unconscious right away,” said Gardell.

As emergency crews worked, several residents spent the afternoon outside in the heat waiting to get back inside their air-conditioned homes.

Residents were allowed back into their apartments around 5 p.m. Wednesday. They had been outside since about 11:30 a.m.

Homeowners also expressed concern for their pets that were left inside the apartment building for hours while crews were dealing with it. A senior center nearby was also told to close its windows and shut off the AC in the 90 degree heat.

The homeowner who intentionally mixed the chemicals together has not been charged.

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