Measurments of the PM10 concentrations on Paris subway trains
For several years, the RATP has been working to get further knowledge into the quantitative and qualitative aspects of aerosols in the subway and to improve the air quality in its network. Some aerosol sources are clearly identified, specifically rolling stock, the outside air, maintenance and civil engineering works, and passengers, that generate fine and coarse particles. PM10 levels have been well studied in different stations representative of the Parisian network. It was also necessary to complete those data with the knowledge of PM10 concentrations in the train, where the passengers are staying 50 minutes a day on average.
The poster compiles the work carried out in 12 lines of the Parisian metro. PM10 concentrations are measured in the train using a Mini-partisol and a Dust trak system to follow the mass of the aerosol in the whole line. Measurements are conducted during three days in each line and during the rush hour of the morning (7h-10h). At the same time, PM10 concentrations are studied in stations crossed by the underground train. This work shows heterogeneous PM10 levels in the RATP network. We observe a good correlation between the PM10 levels measured in the train and those observed in the crossed station. Therefore, the PM10 levels in the lines with aerial sections are lower than those measured in the underground lines. In the same way, different parameters, like ventilation, trains speed (correlated to braking and particles emissions), have a great influence on the aerosol sampled in the train.