Abstract

Long-path monitoring of pollution and greenhouse gas species has been implemented using the technique of differential optical absorption spectroscopy. The concentrations of CO₂, NO₂, and SO₂ molecules are measured using instrumental setups operating in the near-infrared, visible, and ultraviolet wavelength, respectively. In the case of the visible measurement of NO₂, it is found that the data provide information also on the light extinction due to atmospheric aerosols. In addition, the recent progress in the application of a hyper-spectral camera to the two- dimensional observation of air pollutants is briefly discussed.

© 2015 Optical Society of America