Quantification of nitrogen oxides emissions from build-up of pollution over
Paris with TROPOMI
Lorente, A., Boersma, K.F., Eskes, H.J.,
Veefkind, J.P., van Geffen, J.H.G.M., de Zeeuw, M.B.,
Denier van der Gon, H., Beirle, S. and Krol, M.C.: 2019,
Scientific Reports 9, 20033, 10pp.
Abstract
Nitrogen dioxide (NO2) is a regulated air pollutant that is of particular
concern in many cities, where concentrations are high. Emissions of nitrogen
oxides to the atmosphere lead to the formation of ozone and particulate
matter, with adverse impacts on human health and ecosystems. The effects of
emissions are often assessed through modeling based on inventories relying
on indirect information that is often outdated or incomplete. Here we show
that NO2 measurements from the new, high-resolution TROPOMI satellite sensor
can directly determine the strength and distribution of emissions from
Paris. From the observed build-up of NO2 pollution, we find highest
emissions on cold weekdays in February 2018, and lowest emissions on warm
weekend days in spring 2018. The new measurements provide information on the
spatio-temporal distribution of emissions within a large city, and suggest
that Paris emissions in 2018 are only 5-15% below inventory estimates for
2011-2012, reflecting the difficulty of meeting NOx emission reduction
targets.
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created: 17 December 2019
last modified: 19 August 2020