Several methods to measure environmental contaminants have been approved by the Environmental Protection Agency (EPA). The most commonly used are TO-14 and TO-15, where the determination of volatile organic compounds (VOCs) in ambient air is achieved by collecting samples in specially prepared containers. The samples are then analyzed using gas chromatographs (GC) or GC combined with mass spectrometers (GC/MS). The need to first take samples and then analyze them in special laboratories can significantly slow down any decisions to adjust the process if one wants to avoid potentially negative effects on the environment.