This Dad Spotted a Health Hazard on His Son’s School Commute. The Business He Started to Address It Makes About $50 Million a Year.

Duncan McIntyre started a business after spotting a health hazard on his son's school commute. The business aims to reduce kids' exposure to diesel fumes. It now generates approximately $50 million in annual revenue. McIntyre's initiative was driven by concerns over air quality during school transportation.

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