BRIDGETON, Mo. (AP) — New security measures are in place after someone stole air monitors in a neighborhood near a troubled landfill location in St. Louis County.

The Environmental Protection Agency announced the theft on Thursday. The monitors test for radiation, radon and other toxins.

The St. Louis Post-Dispatch (http://bit.ly/1s4d18k ) reports that the monitors have already been replaced.

An underground fire has been smoldering at the Bridgeton Landfill for more than three years, creating a pungent smell. The owner of the landfill is spending millions to address the odor.

Meanwhile, the smoldering fire is near nuclear waste buried in the adjacent West Lake Landfill. A barrier is being built to make sure the fire and the nuclear waste don't meet.

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Information from: St. Louis Post-Dispatch, http://www.stltoday.com