Abstract
In the application of optical methods to remote sensing of air pollution, some difficulties have been experienced in calibrating instruments, based on resonance absorption, that are suitable for air quality measurements over a long pathlength. Instruments for this application are correlation spectrometers (i.e., Barringer Cospec, Barringer Research Ltd., Rexdale, Ontario, Canada) which use a modulated Xe lamp for average concentration measurements of SO<sub>2</sub> at around 310 nm and of NO<sub>2</sub> at around 440 nm, and tunable laser analyzers which use specific absorption of infrared light emitted by a diode laser or by other tunable laser devices.
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