Part of Meramec Caverns to reopen after toxic air discovered

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SULLIVAN, MO - Part of Meramec Caverns will reopen Friday. The caverns have been closed since March 10th, after potentially toxic air was discovered.

The problem started 40 years ago when a nearby factory dumped a degreaser into the groundwater, leading to toxic vapors.

The tourist attraction announced it will resume tours in the upper level of the caverns Friday. The lower levels remain closed.