Field-portable methods for monitoring airborne contaminants and toxins in the workplace have received increasing: attention in recent years. A number of portable monitors for airborne contaminants have been available commercially for many years. However, new developments may provide for on-site compliance monitoring, which has heretofore been more the exception than the rule. The ability to conduct measurements on-site in the occupational setting offers significant advantages. Field-portable methods are often desired so that decisions regarding worker protection, engineering controls, etc., can be made quickly. The capability for rapid decision making offered by on-site monitoring can help save costs, and also offers a means to assess, and thereby, prevent, worker overexposures to toxic s substances in a timely manner. Field-based monitoring is especially useful for applications in the construction industry, in agriculture, and in other industries where jobs may be short-term and the workforce is transient. On-site techniques can also be beneficial in instances where short-term monitoring is desired. In this report, field-portable spectrometric techniques are covered, and some applications are described. Due to limited space here, a general overview is available by consulting the literature referenced herein.