You can't see it or smell it, but high carbon monoxide levels have caused workers to evacuate the Staunton City Hall building several times over the past few days.

City Manager Steve Owen says, "It did cause some disruption in what we would have rather have been working on today. So, yeah, it was disruptive to say the least."

Owen says, while he may have gotten a little less work done, responders have found a potential solution.

Owen says, "We've ordered a part that will install a timer on the fan that will blow the exhaust carbon monoxide out of the boiler chimney better."

Donna Mitchell, a dispatch responder, was asked to leave the building two times in 12 hours.

Mitchell says, "We were down there for a couple of hours, came back, the levels went back up and we had to go through the whole procedure again."

All Staunton 911 emergency calls were transferred to Augusta County's Dispatch Unit.

Mitchell says her main concern was being unable to respond to someone in need.

She says, "We don't very seldom ever have to evacuate this building but to have to do it twice in one day was very hectic today."

No calls went unanswered at the 911 center, and all city workers returned to the building unharmed, but city officials say the high carbon monoxide levels were completely unexpected.

Owen says, "We're not clear on why it's now a problem. This building was done in the early to mid-90s so we don't know why now."

City officials and police have determined the high carbon monoxide levels were only in the northeast corner of the building. They expect all of the levels to return to normal by Tuesday morning.