Aethalometer measurements in a road tunnel: A step forward in the characterization of black carbon emissions from traffic.
Sci Total Environ
; 703: 135483, 2020 Feb 10.
Article
en En
| MEDLINE
| ID: mdl-31761363
ABSTRACT
A sampling campaign was conducted in the Liberdade Avenue tunnel (Braga, Portugal) during a week (with 56,000 vehicles) to monitor black carbon (eBC-equivalent black carbon) by means of an Aethalometer AE-31, and gaseous pollutants (CO2, CO, NOx). Inside the tunnel, the mean eBC mass concentration was 21⯱â¯10⯵gâ¯m-3, reaching a maximum hourly value of 49.0⯵gâ¯m-3. An hourly and weekday-weekend study was carried out. Regarding the Absorption Ångström exponent (AAE), a mean value of 0.97⯱â¯0.10 was obtained, for a source of practically pure traffic. There was a positive significant correlation between eBC and the number of light vehicles (râ¯=â¯0.47; pâ¯<â¯0.001) and between eBC and the gaseous emissions CO (râ¯=â¯0.67; pâ¯<â¯0.001), CO2 (râ¯=â¯0.71; pâ¯<â¯0.001), NO (râ¯=â¯0.63; pâ¯<â¯0.001) and NO2 (râ¯=â¯0.70; pâ¯<â¯0.001). The mean black carbon emission factors (EFBC) inside the tunnel were 0.31⯱â¯0.08â¯g (kgâ¯fuel)-1 and 0.11⯱â¯0.08â¯mg veh-1â¯km-1, similar to those found in other studies for gasoline and diesel vehicles in road tunnels.
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Sci Total Environ
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2020
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Article