Dive Summary:

• The city of Bozeman, Mont. is attempting to remove toxic gases found in houses nearby that may come from the shuttered Bozeman landfill.
• Bozeman hired environmental company Tetra Tech to test the air quality in homes in a neighborhood and found volatile organic compounds (VOC) in 25 residences.
• Although it is not proven that the landfill is the cause of the toxic levels, as some chemicals are present in household products, the city will work to remove the VOCs and to reduce risks associated with long-term exposure.

From the article:

Earlier this spring, 14 ground probes placed near the old landfill's boundary indicated three areas of concern. That prompted the city to notify residents and to hire Tetra Tech to investigate the situation.

“The complicating issue here is that many of these chemicals are also found in household products,” said Kirk Miller, senior project manager for Tetra Tech.

But the VOCs found in the subdivision may be coming from liquid chemicals degrading in the old landfill, then becoming gases and getting into the groundwater or air.