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<p>The present study aims to assess the influence of PM pollution on residents living in proximity to the national highway (NH-19) in a semi-urban area. We collected size-segregated PM samples in the winter season using a Grimm portable monitor in 31 bins. Our results found that the 12-h monthly averages of PM<sub>10</sub>, PM<sub>2.5</sub>, and PM<sub>1&#xa0;</sub>varied from 37.5 to 371.2, 22.4 to 315.7, and 17.5 to 283.3 μgm<sup>−3</sup>&#xa0;respectively. The high level of coarse PM is due to resuspension of road dust by wind and vehicle-induced agitation, whereas the occurrence of fine particles is due to automobile exhaust. Also, the PM level in semi-urban areas exceeded the NAAQS and WHO standard limits.&#xa0;The impact of respiratory deposition doses (RDD) on different sizes of PM concentrations in different respiratory tracts suggested that coarse particles dominate the head (HA) region due to inertial impaction, while fine particle deposition governs the toxicity in the alveolar (AL) and tracheobronchial (TB) regions due to sedimentation and diffusion. Additionally, the place where the physical activities are taking place and the duration time are the decisive factors. The findings of this study will assist localities and health workers in addressing the problem linked to respiratory issues.</p>

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Exposure Assessment of Size Segregated PM and Associated Respirable Deposition Dose in Residential Sites Near National Highway in Northern India

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Shikha,
  • Vishnu Kumar,
  • Anupam Singh,
  • Ajay Taneja

摘要

The present study aims to assess the influence of PM pollution on residents living in proximity to the national highway (NH-19) in a semi-urban area. We collected size-segregated PM samples in the winter season using a Grimm portable monitor in 31 bins. Our results found that the 12-h monthly averages of PM10, PM2.5, and PM1 varied from 37.5 to 371.2, 22.4 to 315.7, and 17.5 to 283.3 μgm−3 respectively. The high level of coarse PM is due to resuspension of road dust by wind and vehicle-induced agitation, whereas the occurrence of fine particles is due to automobile exhaust. Also, the PM level in semi-urban areas exceeded the NAAQS and WHO standard limits. The impact of respiratory deposition doses (RDD) on different sizes of PM concentrations in different respiratory tracts suggested that coarse particles dominate the head (HA) region due to inertial impaction, while fine particle deposition governs the toxicity in the alveolar (AL) and tracheobronchial (TB) regions due to sedimentation and diffusion. Additionally, the place where the physical activities are taking place and the duration time are the decisive factors. The findings of this study will assist localities and health workers in addressing the problem linked to respiratory issues.