Abstract
Several volatile organic compounds (VOCs) have adverse health effects and contribute to reactions promoting photochemical smog. The estimated world-wide average emissions of VOCs are about 1809 million tons/year. This overview focuses on the most commonly used methods for real-time monitoring of VOCs in ambient air, including differential optical absorption spectroscopy (limit of detection (LOD) ∼2.6 μg/m 3), low-pressure chemical ionization/tandem mass spectrometry (MS 2) (LOD ∼2.0 μg/m 3), atmospheric pressure chemical ionization/MS 2 (LOD ∼38.3 μg/m 3) and proton-transfer reaction MS (LOD ∼0.3 μg/m 3). Finally, we present the results from some comparative studies of atmospheric aromatic hydrocarbon measurements involving real-time monitoring methods and gas chromatography-related conventional techniques.
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