Commuters are noticing the high-decibel screeching sounds among BART's five lines. But could the noise be harmful to your health? Map courtesy www.BART.gov.

We now turn to that age-old question: Why is BART so noisy?

It turns out there are specific reasons for the noise and BART officials know what they are. BART officials also say, however, that studies actually rank BART as one of the quietest public transportation systems in the country.

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