77 people treated at local hospitals after Waterloo monster truck rally

“Levels as high as 314 parts per million were detected inside the Hippodrome…ground floor level was 182, and a reading of 232 ppm was found in the women’s bathroom.

The first call to the scene…came for an unconscious person at 9:05 p.m.

…emergency personnel are on standby for such an event, but are not inspecting for hazards like a gas.

…Asked about who has the responsibility of ensuring a safe environment, (fire chief) said the event sponsor or the building owner.”