Today, the Ogawa Passive Sampler is being used world-wide for the collection of NO-NO2, NOx, SO2, O3, and NH3. It can be used as a personal sampler or in micro-environmental outdoor programs. Because the only consumable item for each exposure is the pre-coated collection pad, the Ogawa Passive Sampler System represents one of the lowest cost devices for accurate measurements of large urban and rural areas. The Ogawa Sampler is ideal for low-cost air monitoring programs, personal, outdoors and indoors.