Issue link: https://hi.iaq.net/i/630729
110 Appendix A chemicals (e.g., CO 2 by infrared light), chemical groups (e.g., certain volatile or- ganics by photoionization potential) or broad pollutant categories (e.g., all respi- rable particles by scattered light). Detec- tion limits and averaging time developed for industrial use may or may not be appro- priate for IAQ. Detector tube kit: Detector tube kits generally include a hand pump that draws a known volume of air through a chemically treated tube intended to react with certain contaminants. The length of color stain resulting in the tube correlates to chemical concentration. Personal monitoring devices: Personal monitoring devices (sometimes referred to as "dosimeters") are carried or worn by individuals and are used to mea- sure that individual's exposure to particular chemical(s). Devices that include a pump are called "active" monitors; devices that do not include a pump are called "passive" monitors. Such devices are currently used for research purposes. It is possible that sometime in the future they may also be helpful in IAQ investigations in public and commercial buildings. SIMPLE VENTILATION/COMFORT INDICATIONS Thermal Comfort: Temperature and Relative Humidity The sense of thermal comfort (or discom- fort) results from an interaction between temperature, relative humidity, air move- ment, clothing, activity level, and indi- vidual physiology. Temperature and relative humidity measurements are indicators of thermal comfort. Methodology Measurements can be made with a simple thermometer and sling psychrometer or with electronic sensors (e.g., a thermo- hygrometer). Accuracy of within + or - 1°F is recommended for temperature measure- Above: A smoke tube, which is one type of chemical smoke device. Used to observe patterns of air movement and the direction (negative or positive) of pressure differ- ences. Below: A microman-ometer. Used for measuring pressure differentials to learn about airflow. Provides quantitative data, as compared to the qualitative information provided by chemical smoke.