| Title |
VOC emissions by fresh and old asphalt pavements at service temperatures: impacts on urban air quality |
| ID_Doc |
65075 |
| Authors |
Lasne, J; Lostier, A; Romanias, MN; Vassaux, S; Lesueur, D; Gaudion, V; Jamar, M; Derwent, RG; Dusanter, S; Salameh, T |
| Title |
VOC emissions by fresh and old asphalt pavements at service temperatures: impacts on urban air quality |
| Year |
2023 |
| Published |
Environmental Science-Atmospheres, 3.0, 11 |
| DOI |
10.1039/d3ea00034f |
| Abstract |
Outdoor air pollution is a major cause of chronic illness and of mortality, with an estimated 4.5 million deaths every year. Its effects are amplified in urban areas where the global population concentrates at an increasing pace. Asphalt-covered surfaces dominate urban areas. Although pollutant emissions from asphalt have been investigated at temperatures above 120 degrees C during laying, data on emissions at service temperatures are lacking. In the present work, we characterize and quantify in the laboratory volatile organic compound (VOC) emissions by fresh and old asphalt mixtures with gas chromatography - mass spectrometry/flame ionization detector (GC-MS/FID) and proton transfer reaction - time of flight mass spectrometry (PTR-ToFMS) under simulated atmospheric conditions at service temperatures (23-60 degrees C). The impact of asphalt aging on VOC emissions is assessed. We show that asphalt pavements contribute significantly to urban pollution and therefore need to be included to emission inventories and taken into account by air quality models. VOC emissions from these extended surfaces are shown to be important contributors to ozone and secondary organic aerosol formed in urban areas. This study reveals a large background source of VOCs, precursors of ozone and particulate matter in cities. Specifically, we estimate that in Paris (France), asphalt pavements at service temperatures are responsible for the emission of 0.148 Gg NMVOC per year, corresponding to 21.3% of emissions from road transportation, and 2.9% of total NMVOC emissions in 2019. The corresponding mass of formed Secondary Organic Aerosol (SOA) is estimated as 1.60-4.12 tonnes per year, accounting for 1.5-3.8% of PM1 emitted by road transportation. It suggests that "net zero emissions" targets, such as the zero pollution action plan of the European Green Deal, cannot be met until this new challenge from asphalt pavements is acknowledged and tackled. Reducing emissions from asphalt pavements during service is a major challenge for sustainable cities and needs to be addressed by the scientific community, policy makers and industrial partners. Environmental significance The world's urban population grows at an increasing pace. Urban atmospheric pollution is a prime concern for health and environmental sustainability. Inventories of pollution sources are necessary to account for observations, and to set relevant mitigation targets. Our study provides for the first time the speciation and quantification of volatile organic compound (VOC) emissions from an uncharacterized and widespread urban surface, asphalt pavements, at service temperatures. We determine ozone and secondary organic aerosol (SOA) formation potentials in Paris, France. Our work shows that asphalt pavements significantly contribute to VOC emissions and SOA formation, and might become a dominant urban pollution source in the future. It has strong implications for urban atmospheric chemistry, with the characterization of an extended pollution source. |
| Author Keywords |
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| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Emerging Sources Citation Index (ESCI) |
| EID |
WOS:001118407700001 |
| WoS Category |
Environmental Sciences; Meteorology & Atmospheric Sciences |
| Research Area |
Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences |
| PDF |
https://pubs.rsc.org/en/content/articlepdf/2023/ea/d3ea00034f
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