A study of 33 vehicles found that 60 percent had detectable levels of carbon monoxide, with some reaching dangerous concentrations. This research followed a case where a faulty exhaust system caused chronic health issues in a child, which were initially mistaken for cancer symptoms. Experts are calling for updated safety standards, including in-cabin air quality checks during MOT tests and better access to carbon monoxide monitoring devices for drivers.
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The data on the BMW Z4 is wild. 192 ppm is a massive leak. It makes you wonder how many older internal combustion cars are just leaking toxins into the cabin because of rust. This is a strong argument for accelerating the shift to EVs where this specific failure mode does not exist.
Adding an in-cabin air quality check to the MOT is a practical policy shift. It moves the focus from just tailpipe emissions to actual passenger safety. If the regulatory framework for vehicle inspections updated this, it would create a direct incentive for better exhaust maintenance.
Most people ignore exhaust rust until the car sounds like a tractor. The labor cost to fix a leak is low, but the health cost here was almost catastrophic. It shows that preventative maintenance is the only real way to manage these risks in old fleets.
