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Particulate Matter exposure assessment in underground subway networks

This work’s main goal was to develop an exposure assessment model for PM10, PM2.5 e PM1 for underground subway networks. To support the model development, 12 measuring sessions were made in the Lisbon subway network. Monitoring was made considering 4 different segments of a trip: outside of subway stations, platform access (=path from exterior to the platform), platform and train. The results obtained show that PM concentrations are higher on the underground than outside the subway network. The correlations between outside PM concentrations and station platforms are weak (R 2 =0,10; R 2 =0,02 e R 2 =0,02 for PM10, PM2.5 e PM1 respectively), but between concentration at platforms and the platforms’ access are strong (R 2 =0,71; R 2 =0,83 e R 2 =0,84 to PM10, PM2.5 e PM1 respectively). Based on this, ratios between PM concentration at platforms and the platforms’ access were calculated (1,22; 1,44 and 1,50 for PM10, PM2.5 and PM1 respectively) and used for the PM assessment model. A strong correlation between the time elapsed between each train and the PM concentration inside the train along the yellow line was also found. To apply the model, a “PM exposure tool for subway networks FCEPM” was created based on the data available. This tool provides an estimate for time, PM’s concentration and inhaled PM mass depending on the chosen course and other selections made by the user.