Even so, users are often unaware of the risks of laser usage. Laser processes generate, dependent on laser type and performance, processed material and other factors, hazardous side products. These are, for example, hazardous vapours, gases, particulate matter or aerosols. A wide range of them does already pose a health risk because of their chemical composition, but even seemingly nontoxic substances affect workplace quality by dust and odour nuisance. Furthermore, nontoxic particulate matter is inhaled similar to cigarette smoke and can penetrate deep into the lungs. Hence, effective air purification is vital for quality of workplace conditions and health protection.