Environmental charges in public transport: how they work

Environmental charges linked to transport are levies or surcharges that authorities apply to reduce traffic pollution and fund cleaner mobility. In the case of public transport, they are rarely a single national tax, but rather a combination of local and regional measures: fares that fund fleet renewal, access charges for low-emission zones and levies on the most polluting operators. This article explains how they work and how they fit within green taxation.

Public transport is a key piece in reducing the number of private vehicles on the road and, with them, emissions. To reinforce that role, many local governments combine public investment with fiscal instruments that penalise the most polluting options and reward the cleanest.

What are environmental charges in transport?

They are surcharges set by public authorities with two main aims:

1. To raise funds to improve the quality and sustainability of public transport.
2. To encourage the transition to less polluting systems, such as the electrification of buses or alternative fuels.

Unlike carbon emissions taxes, which directly tax each tonne of CO₂, these charges are usually built into the fare for the service, into the funding of operators or into access to certain urban areas.

The European framework

The European Union promotes environmental fiscal policies that reduce pollution and energy use in transport. Through directives and action plans, and through instruments such as the new emissions trading scheme for road transport and buildings (ETS2, due in 2027), it encourages member states to stimulate the use of public over private transport.

The situation in Spain

Spain has no single environmental charge on public transport. Powers over mobility and taxation are shared between the autonomous communities and town councils, so the map is uneven:

• Some cities allocate part of the fare to renewing the bus and tram fleet with electric or gas vehicles.
• Large cities have introduced low-emission zones (LEZs), mandatory for municipalities of more than 50,000 inhabitants under Climate Change Law 7/2021, where the most polluting vehicles may pay a charge or face restricted access.
• The Climate Change and Energy Transition Law 7/2021 and the new national sustainable-mobility rules set decarbonisation targets that transport must help meet.

Mechanisms of application

There are different ways to apply environmental charges in transport:

1. Surcharge on the ticket fare: the extra cost goes to clean fleets or to expanding the network.
2. Charge on the operator: companies providing the service pay if they exceed a certain level of emissions, which pushes them to modernise their vehicles.
3. LEZ access charges: the most polluting vehicles pay a charge or face restricted access to the city centre.
4. Reliefs: discounts for operators that meet low-emission requirements, fostering green competitiveness.

Impact on users

Benefits

• Better service quality: the revenue can be invested in modernising the fleet, increasing frequency or widening coverage.
• Lower external costs: although the ticket may become more expensive, cleaner transport reduces the health and environmental costs associated with pollution.

Criticisms and challenges

• Social acceptance: fare rises generate resistance if it is not clearly explained what they are invested in.
• Equity: it is essential that the measures do not unduly penalise those with lower purchasing power or without mobility alternatives.

Impact on transport companies

Companies in the sector may face new costs arising from these charges, but they also find opportunities:

• A boost to innovation: pressure to reduce environmental impact accelerates fleet renewal and the adoption of clean fuels.
• Corporate image and access to aid: cleaner companies improve their reputation and can apply for subsidies.

For transport and logistics companies, getting ahead of these measures and measuring the emissions of their activity is increasingly relevant for regulatory compliance.

Outlook

As authorities step up their decarbonisation commitments, environmental charges linked to transport are likely to gain weight. Some trends:

• Variable fares according to the time of day, the type of vehicle or the area of the city.
• Integration with micromobility: bicycles, scooters and other light modes within a single system of charges and reliefs.
• Mobility as a service (MaaS): single fares integrating several transport modes, with green charge scales according to use.

Frequently asked questions

Does the bus user pay an ecological charge?

Not directly or generally. In Spain, public-transport users do not pay an ecological charge as such; what may vary is the fare, which in some cities funds the renewal of clean fleets. Access charges do apply to the most polluting private vehicles in low-emission zones.

Are low-emission zones mandatory?

Yes. Climate Change Law 7/2021 requires municipalities of more than 50,000 inhabitants (and some of more than 20,000) to establish low-emission zones, with access conditions set by each town council.

A tool within green taxation

Environmental charges linked to transport are a green-taxation tool that helps fund service improvements and motivate operators to adopt cleaner technologies. Well designed, they contribute to more sustainable transport systems, ease congestion and reduce urban pollution. For companies in the sector that need to measure and reduce the footprint of their activity, Manglai's service footprint solution helps quantify the emissions of transport and logistics.