The biggest source of exposure is much closer to home than a factory chimney. Photo credit: Marcos del Mazo/Shutterstock
Many of us expect pollution to be concentrated just to major cities such as Madrid or Barcelona, but shockingly millions of people across Spain are breathing air that would fail the European Union’s tougher pollution limits, with the country heading towards a major change in how air quality is judged.
More than 80 per cent of the population is currently exposed to contaminated air when measured against the new European standards, according to Greenpeace, while almost 33 million people were exposed to pollution above the limits the EU plans to introduce by 2030. The warning comes as Spain prepares to bring its air-quality laws into line with a new EU directive expected to be approved by the end of 2026.
Spain’s pollution problem is bigger than today’s legal limits
For those of us living in Spain, the results mean that the air around our homes, workplaces and schools could be considered too polluted under standards that are about to become the new benchmark. Traffic is the main source of pollution, but people living near industrial sites, ports and airports can also be affected.
The 80 per cent figure comes from Greenpeace mobility chief Cristina Arjona, who says more than 80 per cent of Spain’s population breathes polluted air when assessed against the incoming European directive. This detail is important because Spain is currently working with air-quality legislation dating from 2008. The new EU rules are intended to bring permitted pollution levels closer to World Health Organisation recommendations.
That means an area can comply with the limits currently in force while still falling short of the standards Spain is preparing to adopt. The latest figures from Ecologistas en Acción show the scale of that difference. Its annual air-quality report found that almost 33 million people were exposed during 2025 to pollution above the new EU limits contained in Directive 2024/2881.
Traffic remains the biggest source
For most people, the biggest source of exposure is much closer to home than a factory chimney. Road traffic is the principal source of air pollution in Spain, producing pollutants including nitrogen dioxide and particulate matter through the burning of fossil fuels. People living close to certain industrial facilities, ports, airports and areas where rubble or other materials are loaded and unloaded can face additional exposure.
That makes air quality a problem that can follow people through ordinary parts of their day, particularly in built-up areas with heavy traffic. Greenpeace is also questioning whether all of Spain’s low-emission zones are delivering the reductions expected of them. Municipalities with more than 50,000 inhabitants have been required to establish these zones since 2023, but Arjona says some measures have had limited impact.
In some cases, she argues, areas that were already pedestrianised have been included without producing a significant additional reduction in pollution. Madrid, Barcelona and Pontevedra are among the cities Greenpeace says have achieved improvements.
Heat can make the problem worse
Spain’s pollution problem is also being complicated by increasingly difficult weather conditions. High temperatures and prolonged periods of sunshine can contribute to the formation of ground-level ozone, another major air pollutant. This is particularly relevant during hot weather because ozone is formed through chemical reactions involving other pollutants in the atmosphere.
The latest annual assessment from Ecologistas en Acción found that ozone pollution reached its highest levels in Spain since 2015 in 2025, with heatwaves contributing to the problem. That creates a particular challenge for Spain as extreme heat becomes a recurring feature of summer rather than an occasional event.
What changes before the end of 2026?
The immediate issue for residents is not that Spain’s air suddenly becomes more polluted when the new rules arrive. It is that the legal definition of acceptable air quality is about to become stricter. The new European directive will require Spain to change legislation that has been in place since 2008, with the aim of moving national limits closer to WHO recommendations. Greenpeace is calling for Spain to go further than the minimum European requirements when it incorporates the rules into national law.
The organisation wants measures including effective low-emission zones, fewer motorised journeys and greater use of public transport, cycling and other sustainable forms of transport. It is also calling for greater scrutiny of major infrastructure projects such as airports and ports, alongside changes to where pollution monitoring stations are located.
The air can look clean without being clean
One of the difficulties for residents is that much of the pollution involved cannot simply be seen from the street. Nitrogen dioxide and fine particles can be present in the air without creating a visible haze, while ozone pollution can rise during bright, hot weather.
That makes official monitoring particularly important because residents cannot judge their exposure simply by looking outside. Greenpeace has raised concerns that some monitoring stations are positioned in parks or open areas where traffic levels are lower, potentially giving a less representative picture of the pollution experienced by people living and travelling in busier areas.
Spain faces a tougher air-quality test
The significance of the latest warning is therefore not simply that more than 80 per cent of Spaniards are described as breathing contaminated air. It is that Spain is approaching the point where millions of people will be living under a new definition of what constitutes acceptable air, and the latest evidence suggests a large proportion of the country is not yet meeting it.
With the new EU standards set to shape Spanish legislation from the end of 2026 onwards, pressure will shift towards cities and regional authorities to show whether measures already in place are actually reducing the pollution people breathe. For residents, the change could make air quality a much more visible issue in the months and years ahead, not because the air suddenly changes, but because the standard used to judge whether it is safe is finally getting tougher.
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