A union asked the Center to conduct a work site analysis for its employees who were complaining of headaches, dizziness and nausea at work. The employees said that their symptoms decreased when they were not at work.

The employer, who ran a city garage, had done some air sampling, but did not find a problem.

One day the employees were seen in the Center clinic immediately after work. Blood work results showed a number of workers with elevated carbon monoxide levels.

Center staff were invited to a labor/management meeting to discuss findings and to make recommendations.

As a result work practices changed:
Trucks, at idle, warmed up outside, exhaust hoses were hooked up and used at all times when repairs were being made and more fresh air was added to the ventilation system.

Consequently, workers felt better and the employer's cost of making the changes was very small.