Health risk assessment of polycyclic aromatic hydrocarbons (PAHs) adsorbed in PM2.5 and PM10 in a region of Arequipa, Peru
Larrea Valdivia, Adriana E. | Reyes Larico, Juan A. | Salcedo Peña, Jimena | Wannaz, Eduardo D.
The concentrations of PM₂.₅ and PM₁₀, as well as those of the PAHs bound to these particles, were quantified at four sites in the region of Arequipa, Peru, during the year 2018. These samples were collected with high volume samplers, and the concentrations of the PAHs were quantified by liquid chromatography (HPLC). The values found for PM₂.₅ and PM₁₀ at all the sampling sites in Arequipa exceeded the norms established in Peru (50 μg m⁻³ annual average value for PM₁₀ and 25 μg m⁻³ annual average value for PM₂.₅), with the industrial site presenting the highest values of particulate matter (PM₁₀ max = 235.1 μg m⁻³; PM₂.₅ max = 218.4 μg m⁻³). With respect to seasonality, in the cold season (winter), the concentration of particles was higher compared to the other seasons. Concerning the PAHs, it was found that these had the highest concentrations at the industrial site, followed by the site with high vehicular traffic, with both these sites differing significantly from the rural sites. In addition, at the industrial and high traffic sites, there was a predominance of PAHs with 5 and 6 rings, whereas at the rural sites, PAHs with fewer rings predominated. Finally, the calculated values of lifetime lung cancer risk also revealed a difference between sites with marked emission sources, where irrigation was considered moderate, and the rural sites, where irrigation was considered low. This demonstrated that people living at sites with mobile sources and/or industries had a higher cancer risk compared to the inhabitants of rural sites.
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