Seasonal differences of the atmospheric particle size distribution in a metropolitan area in Japan

Prediction of ultrafine particle number concentrations in urban environments by means of Gaussian process regression based on measurements of oxides of nitrogen

“…These observations are also in agreement with the study of Kumar et al (2009) and Fujitani et al (2012), especially given that the short lived nucleation particles are not monitored in this study.…”

“…For example, studies carried out near highways show that number concen-trations of particles decrease exponentially with the increasing downwind distance from the highway (Buonanno et al, 2009;Fujitani et al, 2012).…”

Recycling concrete: An undiscovered source of ultrafine particles

“…There was over a 2-fold decrease in PNC between the first two (L 1 and L 2 ) and second two (L 2 and L 3 ) sampling locations, but this decrease was modest (~30%) between L 4 and L 5 . The sharp decay of PNC close to the source was expected, due to much larger concentration gradients between the emission and background levels, as was also reported by a number of vehicle emission studies (Carpentieri and Kumar, 2011;Fujitani et al, 2012;Pirjola et al, 2006;Zhu et al, 2002).…”

Physicochemical characteristics and occupational exposure to coarse, fine and ultrafine particles during building refurbishment activities

“…Needless to mention that emission sources (e.g. tailpipe of vehicles) are closest to the roadsides and therefore already high PNCs are expected at such locations (Fujitani et al, 2012;Kumar et al, 2008). For the first time the above findings clearly highlight that workers at the refurbishment sites spend long hours and they are exposed to much higher PNCs than those experienced in outdoor ambient or micro-transport environments, indicating a clear need for limiting occupational exposure at such sites.…”