Low Emission Zones Deepen Urban Inequalities Rather Than Reduce Them
Up to 20% reduction in access to employment for employees and workers: this is the unexpected effect of Low Emission Zones (LEZ) in six out of eight French cities studied. These environmental measures, supposed to improve air quality for everyone, reproduce the social fractures they claim to combat.
A new study by Charlotte Liotta, researcher at Universitat Autònoma de Barcelona, reveals the democratic paradox of French LEZs. By banning access to the oldest vehicles, these public policies massively penalize populations who need environmental health improvements most: working-class populations.
The Essentials
- LEZs reduce employment access by 20% for employees and workers in 6 out of 8 cities studied
- Paris, Lyon, Marseille, and five other major cities apply circulation restrictions according to Crit’Air stickers
- 67% of the most modest households own vehicles classified as Crit’Air 3 or more polluting
- Executives and liberal professions retain 95% of their accessibility to urban jobs
- 43 LEZs are planned by 2025 in France, affecting 35% of the population
Six Cities Out of Eight Massively Penalize Working-Class Populations
The analysis covers Paris, Lyon, Marseille, Toulouse, Nice, Montpellier, Strasbourg, and Grenoble. In six of these major cities, circulation restrictions based on Crit’Air stickers create differentiated access to employment according to socioprofessional category.
In Lyon, an employee loses on average 18% of access to available positions if they own a diesel vehicle predating 2011 (Crit’Air 3 or higher). In the same situation, a senior executive experiences only a 3% decline. This difference is explained by habitat geography: working-class populations live massively in the periphery, where public transport supply remains limited.
Marseille shows the most marked disparities. Restricting Crit’Air 3 and above vehicles reduces employment accessibility by 22% for a worker, compared to 2% for an executive. This asymmetry reflects a French socio-spatial reality: 73% of working-class households live in suburbs or peri-urban municipalities, according to INSEE.
67% of Modest Households Own “Polluting” Vehicles
The study reveals the direct correlation between income and vehicle fleet age. Households in the first income decile own vehicles classified as Crit’Air 3, 4, or 5 in 67% of cases—in other words, banned in most active LEZs.
This distribution is not accidental. A new Euro 6 vehicle costs on average 32,000 euros, compared to 8,500 euros for a 2010 diesel. The difference represents nearly two years of income for a household in the first quintile. Public subsidies for purchasing clean vehicles, capped at 7,000 euros for modest households, cover only one-quarter of this gap.
French automotive geography thus reproduces income inequalities. Executives and upper intellectual professions own recent vehicles (Crit’Air 1 or 2) in 78% of cases, guaranteeing them maintained access to urban centers. This technical divide becomes a social divide when LEZs come into effect.
The Public Transport Alternative Remains Insufficient in Peripheral Areas
The theoretical efficiency of modal shift collides with the realities of territorial planning. In peri-urban areas where employees and workers live massively, public transport coverage accounts for 34% of home-work journeys, according to the Agency for Environmental Protection and Energy Management.
This structural weakness worsens with urban sprawl. Service, commerce, and industry jobs relocate to peripheries where commercial rents remain affordable. These new employment basins escape public transport networks, designed according to a radial center-periphery logic.
Charlotte Liotta’s study confirms this asymmetry: jobs accessible by public transport for a suburban resident represent 23% of the total metropolitan area in Lyon, compared to 67% for a city center resident. This access inequality preexists LEZs, but the latter amplify it by removing the automobile alternative for the most constrained households.
LEZs Reproduce the Logic of Ecological Bonus-Malus
This mechanism of spatial exclusion recalls the regressive effects of automotive bonus-malus analyzed by the Ministry of Ecological Transition. This policy, intended to orient purchases toward less polluting vehicles, massively benefits affluent households capable of investing in new cars.
Between 2008 and 2022, 67% of ecological bonuses benefited the three highest income deciles. The malus, meanwhile, weighs primarily on middle classes forced to buy second-hand. This inverted redistribution reproduces itself with LEZs: they facilitate circulation of recent (and expensive) vehicles while penalizing older (and affordable) ones.
The logic is identical to that observed in other ecological transitions: environmental policies, when they do not correct access inequalities to clean solutions, tend to crystallize them.
Nineteen Metropolises Required to Implement LEZs by 2025
The generalization of LEZs does not stem from local choice but from legal obligation. The 2019 Mobility Guidance Act requires their creation in any agglomeration exceeding 150,000 inhabitants that exceeds air quality thresholds. Nineteen metropolises are concerned by 2025, affecting 35% of the French population.
This European obligation, stemming from Directive 2008/50/CE, aims to reduce the 40,000 annual deaths linked to atmospheric pollution in France. Health benefits are documented: a 10 μg/m³ decrease in PM2.5 reduces mortality by 6% according to the World Health Organization.
But this health legitimacy does not resolve the distributive question. Charlotte Liotta’s study suggests that LEZs protect urban centers priority—where the best-endowed social categories reside. Peripheries, more exposed to industrial and road pollutions, benefit less from these improvements while undergoing access restrictions.
London’s Experimentation Reveals Accompanying Solutions
London, a pioneer of low emission zones with the Ultra Low Emission Zone (ULEZ) since 2019, develops corrective mechanisms. The municipality established a transition fund of 110 million pounds, specifically targeting modest households and small businesses.
This mechanism finances replacement of old vehicles to the tune of 9,500 pounds per vehicle for households eligible for social aid. It also covers conversion of commercial vehicles for craftspeople and traders. This redistributive approach limits regressive effects: employment accessibility declines only 4% for popular categories, compared to 20% without support.
France could draw inspiration from this corrective logic. Several major cities are experimenting with local aid: Grenoble allocates 5,000 euros for purchasing a recent used electric vehicle, Lyon develops zero-interest loans for modest households. These initiatives remain marginal relative to the scale of needs.
Toward Reform of Public Aid Eligibility Criteria
LEZ equity requires an overhaul of clean mobility aid. The current system privileges new purchases, inaccessible to constrained households. A reorientation toward recent used vehicles (less than five years old) would triple the number of potential beneficiaries according to ADEME.
This reform also requires territorial differentiation. Metropolises where the public transport alternative remains weak should benefit from enhanced aid envelopes. This differentiated territorial approach already exists for the conversion bonus: it varies from 1,500 to 5,000 euros depending on residence area.
The LEZ question reveals a broader issue of justice in urban ecological transitions. As illustrated by other mutations in work and urban space, the ecological transformation of cities cannot ignore its distributive effects without losing democratic legitimacy.