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Recently, drive-by air pollution sensing systems have emerged as a promising approach for air quality monitoring, utilizing sensors mounted on taxis, buses, trams, and other vehicles. [26] In particular, buses have garnered considerable attention as a mobile sensing platform due to their widespread availability and extensive geographical coverage.
A hand-held particle counter is a small, self-contained device that is easily transported and used, and designed for use with Indoor Air Quality (IAQ) investigations. Though lower flow rates of 0.1 ft 3 /min (0.2 m 3 /h) than larger portables with 1 ft 3 /m (2 m 3 /h), hand-helds are useful for most of the same applications.
They're also much less accurate than the highly sensitive, automated monitoring equipment used in roadside pollution monitoring cabins. Sources of inaccuracy include air turbulence (caused by things like wind movements or air conditioners), pollution from building ventilation systems, ultraviolet light (theoretically absorbed by the plastic ...
Sorbent tubes are the most widely used collection media for sampling hazardous gases and vapors in air, mostly as it relates to industrial hygiene. They were developed by the US National Institute for Occupational Safety and Health (NIOSH) for air quality testing of workers. Sorbent Tubes are available from CARO Analytical Services, SKC Inc ...
Passive or "diffusive" air sampling depends on meteorological conditions such as wind to diffuse air pollutants to a sorbent medium. Passive samplers, such as diffusion tubes, have the advantage of typically being small, quiet, and easy to deploy, and they are particularly useful in air quality studies that determine key areas for future continuous monitoring.
Schematic diagram of a tapered element oscillating microbalance Air quality monitoring equipment at New York's Pennsylvania Station. Two different types of particulate matter samplers exist that measure particulate mass concentration: manual samplers and automated samplers.
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