A couple of Google's office buildings in Mountain View, California are having issues with toxic fumes that are likely the result of the previous owners of the land. Buildings QD6 and QD7 were found to have high levels of trichloroethylene (TCE), a toxic solvent used in the manufacturing of electronic chips.
The previous owners of the land were Fairchild Semiconductor, Intel, Raytheon, and other chip makers. These companies dumped thousands of gallons of THC into the ground, which has contaminated the water. Google installed air filters when they moved in and conducted air quality tests.
Readings as high as 8 micrograms per cubic meter were recorded. Normal exposure is 5 micrograms per cubic meter. The EPA has said that it would take decades of exposure to cause problems, not the few months that Google employees experienced.
Google released a statement, saying "The health and safety of our employees is Google's number one priority, and we take several proactive measures to ensure the healthiest indoor air environments possible."