The oxidative potential of particulate matter (PM) in different regions around the world and its relation to air pollution sources

Abstract

In this study, we investigated the impact of urban emission sources on the chemical composition of ambient particulate matter (PM) as well as the associated oxidative potential. We collected six...

Sensitivity of PM10 oxidative potential to aerosol chemical composition at a Mediterranean urban site: ascorbic acid versus dithiothreitol measurements

“…The values obtained by the two methods were larger than those found at a suburban site in southern Italy ( OP AA m = 0.009 nmol min −1 µg −1 , OP DTT m = 0.008 nmol min −1 µg −1 ; Pietrogrande et al 2018). The average OP DTT m was also slightly higher than the values reported for the same PM fraction in Riyadh (Saudi Arabia;OP DTT m = 0.009 and 0.013 nmol min −1 µg −1 during dust and non-dust periods, respectively; Farahani et al 2022). The intrinsic DTT activity was, however, significantly lower than the values measured for PM 2.5 in more populated and polluted cities such as Milan (0.065 nmol min −1 µg −1 ), Athens (0.049 nmol min −1 µg −1 ) and Los Angeles (0.028 nmol min −1 µg −1 ) (Farahani et al 2022), which indicates that atmospheric aerosols in these urban areas contain more toxic components.…”

“…The results for the winter and summer seasons are presented in Table 3. Correlations were considered high for r ≥ 0.7 and moderate for r between 0.45 and 0.70, according to the criteria of previous works (Calas et al 2018;Farahani et al 2022;Janssen et al 2014).…”

“…For example, they found that traffic had a higher DTT intrinsic activity than biomass burning; however, biomass burning was the largest contributor to the volume-normalized DTT activity due to the strength of this source during the study period. (2) The larger oxidative potential of some species per unit mass may mask the capability of other PM 10 components to induce redox reactions (Farahani et al 2022). For example, the greater potency of Cu on a per unit mass basis in generating redox activity for the AA assay compared to secondary ions or carbonaceous species may have led to low r values between AA and the mass fraction of these components.…”

The Fallout of Catastrophic Technogenic Emissions of Toxic Gases Can Negatively Affect Covid-19 Clinical Course

“…Figure 5 shows the level of PM-10 concentration in Europe. It shows how its concentration was increased over the Padana landscape [ 18 ].…”

“…Тем не менее, оба эти газа, как известно, обладают мутагенными и канцерогенными свойствами [7,[11][12][13][14][15] концентрация РМ-10 в Европе. Хорошо видно, насколько превышена концентрация РМ-10 в районе Паданской равнины [18].…”