In recent years there has been much concern about air pollutants in the museum environment. The Getty Conservation Institute has undertaken an extensive environmental research program quantifying pollutants in the museum environment. Dynamic sampling methods were used to detect low parts per billion (ppb) levels of many of these pollutants. Simple, economical passive monitors have been developed based upon the chemistry used in the dynamic sampling modes. Commercially available monitors and a generic passive sampler are discussed. Some passive samplers can be used for direct reading (no analysis required) determination of a number of pollutants. Validation studies are presented along with applications and use of the passive monitors.