Influence of ozone precursors and PM10 on the variation of surface O3 over Kannur, India

Impact of medium-distance pollution sources in a Galician suburban site (NW Iberian peninsula)

“…This corresponded to the hours of maximum solar radiation, as O 3 formation depends on photochemical processes. It also coincided with a minimum concentration of NO, because O 3 concentrations can be explained considering its reactivity with NO, which is emitted mainly by cars, to yield NO 2 (Iqbal et al, 2014;Reche et al, 2011;Felipe-Sotelo et al, 2006;Mavroidis and Ilia, 2012;Notario et al, 2012;Nishanth et al, 2014). The 'weekend effect' on the ozone formation was clear as its concentrations on Saturday and Sunday were higher than on weekdays (e.g., 47 μg m − 3 for weekdays and 58 μg m − 3 for weekends, in 2009), which corresponded to lower concentrations of O 3 precursors, NO + NO 2 and volatile organic compounds (Bigi and Harrison, 2010;Moreno et al, 2009;Qin et al, 2004;Hellebust et al, 2010).…”

Temporal Changes in Air Quality during a Festival Season in Kannur, India

“…The timer attached to this sampler accurately measured the duration of airflow through the filter. Earlier, we studied the influence of O 3 precursors and particulate matter on the variation of surface O 3 over this location using this set up [55]. Nitric acid was used to digest the filters collecting PM 10 on a hot plate.…”

Ambient Level of NOx and NOy as Indicators of Photochemical Activity in an Urban Center

“…Observational-based approaches have proven to be valuable for describing the conditions and regimes that foster air pollution. Some observational approaches use considerable amounts of data that can be obtained through networks of routine air quality and meteorological monitoring stations, and conclusions are then inferred based on the statistical analysis of these data [11][12][13][14][15][16][17]. The analyses of these databases can be enhanced if information is also available for additional indicator species that are typically not routinely monitored, such as NO y .…”