Only when lead concentrations reach high levels do they start to pose a threat to your health. (mindbodygreen.com)
However, it is advised for young children to be tested for exposure to lead if they play in areas where lead concentrations exceed 100 parts per million. (treehugger.com)
The EPA has stated that indoor air quality is 3 times more polluted than outdoor air quality and a 2000 study found that there is an increase in lead concentrations in our indoor air (Sobel et al., 2000b). (cheeseslave.com)