The Ogawa Passive Sampler is a simple passive sampler,
requiring no outside source of power
which can determine the quantity of basic air-quality gases
in ambient air, including
O3, NO, NOx, NO2, SO2, and NH3
It is extremely accurate, easy to use, and less expensive than most.
It has been used worldwide for over 25 years, and is highly regarded as one of the best passive
samplers in the industry.