This volume provides detailed, ready-to-use protocols for air monitoring methods, developed to monitor concentrations of occupational toxicants at the workplace, while they can also be used for environmental monitoring. All the methods are reliable, reproducible, adhere to quality assurance standards and cover all the required steps from sampling to the interpretation of results. This includes data on precision, accuracy, and detection limit, calibration procedures as well as potential sources of systematic errors. In addition, the advantages and disadvantages of each method are clearly outlined.