Working Papers

• The Cost of Air Pollution for Workers and Firms, with Hélène Ollivier (Updated version coming soon)
  Abstract:

  
  

  This paper shows that even moderate levels of air pollution, such as those found in Europe, harm the economy by decreasing firm performance. We estimate the causal effect of fine particulate matter pollution (PM2.5) on firms’ monthly sales and worker absenteeism using matched employer-employee data from France and granular measures of air pollution from 2009 to 2015. We exploit variation in air pollution induced by changes in monthly wind directions at the postcode level. We find that a 10 percent increase in monthly PM2.5 exposure decreases sales in the following two months by 0.7 percent on average. This effect hides heterogeneous across economic sectors, with lower effects for manufacturing, construction and business-to-business trade and services, and larger effects for retail and business-to-consumer services, serving a local demand. Concurrently, worker absenteeism due to sick leave increases by 1 percent, underscoring the negative effects of air pollution on workers’ health. Yet sales losses are an order of magnitude larger than we would expect if worker absenteeism was the only factor via which air pollution affects sales. This suggests a potentially large effect of air pollution on the productivity of non-absent workers, for which we find suggestive evidence, and on local demand.

• Estimating the Local Air Pollution Impacts of Maritime Traffic: A Principled Approach for Observational Data, with Leo Zabrocki and Marie-Abele Bind [Latest version]
  Abstract:

  
  

  We propose a new approach to estimate the causal effects of maritime traffic on air pollution when natural or policy experiments are not available. We apply this method to the case of Marseille, a large Mediterranean port city, where air pollution emitted by cruise vessels is a growing concern. Using a recent matching algorithm designed for time series data, we create hypothetical randomized experiments to estimate the change in local air pollution caused by a short-term increase in cruise traffic. We then rely on randomization inference to compute nonparametric 95% uncertainty intervals. We find that cruise vessels’ arrivals have large impacts on city-level hourly concentrations of nitrogen dioxide, particulate matter, and sulfur dioxide. At the daily level, road traffic seems however to have a much larger impact than cruise traffic. Our procedure also helps assess in a transparent manner the identification challenges specific to this type of high-frequency time series data.

Work in progress

• The Long-term and Cumulative Effects of Air Pollution, with Julia Mink, Hélène Ollivier and Aurélien Saussay
• Cycling Infrastructures, Environmental Amenities and Voting, with Léa Bou-Sleiman
• The Gender Gap in Carbon Footprint, with Ondine Berland

Publications

Clean energy transition

• Carbon Pricing and Power Sector Decarbonisation: Evidence from the UK. Journal of Environmental Economics and Management (JEEM), Volume 111, January 2022. [Working Paper], [Lay Summary]. Media Coverage: The Economist, L’Usine nouvelle
  Abstract:

  
  

  Decreasing greenhouse gas emissions from electricity generation is crucial to tackle climate change. Empirically, however, little is known about the effectiveness of existing economic instruments in the power sector. This paper examines the impact of the UK Carbon Price Support (CPS), a carbon tax implemented in the UK power sector in 2013. Relative to a synthetic control unit built from other European countries, I find that emissions from the UK power sector declined by 20 to 26 percent per year on average between 2013 and 2017. The tax operated via three mechanisms: a decrease in emissions at the intensive margin; the closure of some high-emission plants at the extensive margin; and a higher probability of closure for plants already at risk due to European air quality regulations.

• Why investing in new nuclear plants is bad for the climate. (with Luke Haywood and Robert Pietzcker). Joule, Commentary, 1663–1678, August 2023. Media Coverage: Euractiv, PV Magazine, Focus

Greening urban transport

• Air Pollution and CO2 from Daily Mobility: Who Emits and Why? Evidence from Paris. (with Philippe Quirion). Energy Economics, Volume 109, May 2022. [Replication package], [Working Paper]. Media Coverage: Actu Environnement
  Abstract:

  
  

  Urban road transport is an important source of local pollution and carbon emissions. Designing effective and fair policies tackling these externalities requires understanding who contributes to emissions today. We estimate individual transport-induced pollution footprints combining a travel demand survey from the Paris area with NOx, PM2.5 and CO2 emission factors. We find that the top 20% emitters contribute 75-85% of emissions on a representative weekday. They combine longer distances travelled, a high car modal share and, especially for local pollutants, a higher emission intensity of car trips. Living in the suburbs, being a man and being employed are the most important characteristics associated with top emissions. Among the employed, those commuting from suburbs to suburbs, working at a factory, with atypical working hours or with a manual, shopkeeping or top executive occupation are more likely to be top emitters. Finally, policies targeting local pollution may be more regressive than those targeting CO2 emissions, due to the different correlation between income and the local pollutant vs. CO2 emission intensity of car trips.

• Tackling Car Emissions in Urban Areas: Shift, Avoid, Improve. (with Philippe Quirion). Ecological Economics, Volume 213, November 2023. [Working Paper]. Media Coverage: France Culture
  Abstract:

  
  

  Car use imposes costly environmental externalities. We investigate to what extent car trips could be shifted to low-emission modes, avoided via teleworking, or improved via a transition to electric vehicles in the context of daily mobility in the Paris area. We derive counterfactual travel times for 45,000 car trips from a representative transport survey, and formulate modal shift scenarios including a maximum acceptable increase in travel time. For a daily travel time increase below 10 min, 46% of drivers could shift to e-bike – mostly – or public transit – rarely –, with half of them benefiting from a travel time decrease. Such modal shift would reduce daily mobility emissions by 15% and generate annual climate and health benefits worth €125 million. Factors such as living in the far suburbs, being male, or having a high income, are associated with inability to shift modes. Teleworking two days a week could save an additional 5% of emissions. Holding demand for mobility and public transport infrastructure fixed, greater emission reductions require improving cars' environmental performance via a transition to electric vehicles.

• The untapped health and climate potential of cycling in France: a national assessment from individual travel data (with Emilie Schwarz, Audrey de Nazelle, Philippe Quirion and Kévin Jean). The Lancet Regional Health - Europe, February 2024. Media Coverage: Le Monde
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  Promoting active modes of transportation may generate important public health and climate mitigation benefits. We assess mortality and morbidity impacts of cycling in a country with relatively low levels of cycling, France, along with associated monetary benefits. We use individual data from a nationally-representative mobility survey conducted in 2019. We conducted a burden of disease analysis to assess the incidence of five chronic diseases and numbers of deaths prevented by cycling, based on national incidence and mortality data and dose-response relationships from meta-analyses. We assessed the corresponding direct medical cost savings and the intangible costs prevented based on the value of a statistical life year. The French adult (20-89 years) population was estimated to cycle on average of 1min 17sec per person per day in 2019, with important heterogeneity across gender and age. This yielded benefits of 1,919 (uncertainty interval, UI: 1,101-2,736) premature deaths and 5,963 (UI: 3,178-8,749) chronic disease cases prevented, with males enjoying nearly 75% of these benefits. Direct medical costs prevented were estimated at €191 million (UI: 98-285) annually, while the corresponding intangible costs were nearly 25 times higher (€4.8 billion, UI: 3.0-6.5). On average, €1.02 (UI: 0.59-1.62) of intangible costs were prevented for every km cycled. Shifting 25% of short car trips to biking would yield approximatively a 2-fold increase in the number of deaths prevented, while also reducing CO2 emissions by 0.257 MtCO2e (UI: 0.231-0.288).

Policy and outreach

• [in French], Le vélo, un potentiel inexploité pour améliorer la santé (et le climat), with Kévin Jean, Audrey de Nazelle and Philippe Quirion, The Conversation, April 2024
• [in French], Le vélo, meilleur atout pour réduire la pollution et les temps de trajet - L’exemple de l’Île de France, with Philippe Quirion, The Conversation, January 2024
• The Energy and Climate Crisis Facing Europe: How to Strike the Right Balance, with Julius Andersson, FREE Policy Brief, May 2022
• [in French], Connaître et réduire les émissions polluantes dues au transport routier en Ile-de-France, with Philippe Quirion, Dossiers Mobilités Décarbonées: Enjeux et Solutions, Cerema & Construction 21, April 2021