Several buildings in downtown Louisville, including Metro Hall, were evacuated Tuesday morning after reports of a gas leak.
A natural gas leak Friday morning closed part of Baxter Avenue in Louisville's Highlands neighborhood.
Louisville Gas and Electric is reminding people to call before digging to make sure there isn't a utility line.
The LG&E billboard warns that a rotten egg smell could signal a gas leak. But the eggs themselves are dressed with chains, backwards hats, beanies and sunglasses.
EMS helped the four people who were exposed to the CO, and one person went to the hospital.
Churchill Downs said simulcasting was suspended "due to an unexpected construction disruption."
Classes were canceled for Tuesday due to the freezing temperatures expected throughout the evening and into the morning.
County officials on their website indicated that it appeared as though gas was leaking from one of the boilers in the basement.
Officials say a call about the gas leak was received Saturday around 9:10 a.m.
The road is currently closed between Beharell Avenue and Terrace Court.