ABSTRACT
Measurements of ambient gaseous pollutants using long-path length differential optical absorption spectroscopy (DOAS) in the daytime and nighttime have been carried out at many locations worldwide (Platt et al. 1980a; Barrefors 1996; Brocco et al. 1997; Petrakis et al. 2003; Chiu et al. 2005; Lee et al. 2005; Hao et al. 2006; Avino and Manigrasso 2008b; Triantafyllou et al. 2008). The species of interest include both primary and secondary pollutants such as sulfur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), formaldehyde, nitrous acid, benzene, and toluene. The focus of data analysis was placed on the impact of these species in the context of atmospheric chemistry.
