Air quality across a swathe of Europe is expected to decline in the coming days, driven by a rise in fine particulate matter pollution, according to the Copernicus Atmosphere Monitoring Service (CAMS). The European Union agency, which monitors atmospheric conditions, has issued a warning encompassing Ireland, Germany, France, the Netherlands, Belgium, and the United Kingdom.
The primary culprit behind the anticipated deterioration is an increase in ammonia emissions, largely stemming from the springtime application of agricultural fertilizers. This isn’t a novel phenomenon, but CAMS Director Laurence Rouil notes the current situation is “notable and can be intensified by stable and mild meteorological conditions and atmospheric inversions.” The combination of these factors creates conditions where ammonia readily transforms into aerosols and fine particulate matter – specifically, PM2.5 – posing a risk to public health.
What is PM2.5 and Why is it Dangerous?
PM2.5 refers to particulate matter measuring 2.5 micrometers in diameter or less – incredibly tiny, roughly one-thirtieth the width of a human hair. These microscopic particles are particularly dangerous because they can bypass the body’s natural defenses and penetrate deep into the lungs, and even enter the bloodstream. CAMS explains that prolonged exposure to PM2.5 can increase the risk of heart disease, stroke, and other respiratory illnesses.
The Role of Agriculture and Weather Patterns
The increase in ammonia emissions is directly linked to agricultural practices. When fertilizers are spread on fields, they release ammonia into the atmosphere. Under stable weather conditions – characterized by cool mornings and warmer afternoons – this ammonia undergoes a chemical process that forms aerosols and fine particulate pollution. This springtime pattern is common, but the intensity can vary depending on meteorological factors. Adding to the issue, increased pollen concentrations from birch and alder trees are similarly contributing to the decline in air quality.
Beyond Agriculture: Existing Pollution Sources
Although agricultural emissions are a key driver of the current forecast, CAMS emphasizes that existing pollution sources continue to contribute to regional air quality issues. Background levels of pollution linked to fossil fuel combustion, particularly in Eastern Europe and the Balkans, remain a consistent concern. These ongoing emissions, combined with the increased ammonia and pollen, create a complex mix of pollutants affecting a large geographic area.
What CAMS is Saying
Laurence Rouil, Director of CAMS, stated, “Forecasts show that ground level fine particulate concentrations are likely to increase over the coming days.” She further explained that “Agricultural ammonia emissions combined with nitrogen oxide emissions from other sectors like road transport, are expected to be a major contributor to PM2.5 formation, causing increased concentrations of fine particles in the atmosphere of the affected areas.”
Copernicus and Atmospheric Monitoring
The Copernicus Atmosphere Monitoring Service, implemented by the European Centre for Medium-Range Weather Forecasts (ECMWF) on behalf of the European Union, provides crucial data and information about the composition of the atmosphere. Copernicus monitors greenhouse gases, aerosols, ozone, and other atmospheric components to support policymakers, businesses, and citizens. The service builds upon years of research and development through previous EU-funded projects, consolidating expertise from across Europe.
Monitoring the atmosphere is vital for addressing pressing environmental concerns, including climate change and public health. The increasing concentration of greenhouse gases and the impact of aerosols on climate are key areas of focus. At the Earth’s surface, air quality directly affects human health, ecosystems, and infrastructure. CAMS also tracks dust, smoke, and volcanic aerosols, which can disrupt transportation, solar energy production, and satellite observations.
The service is currently adapting to changes in its global fire monitoring capabilities as NASA’s MODIS instruments, used for decades, approach the end of their operational life. Recent years have also seen intense wildfire activity, including a significant wildfire season in the Northern Hemisphere in 2025 and intense fires in the Southern Hemisphere in early 2026.
The CAMS forecast for deteriorating air quality serves as a reminder of the complex interplay between human activities, weather patterns, and environmental health. Residents in the affected countries are advised to stay informed about local air quality reports and take appropriate precautions, especially those with pre-existing respiratory or cardiovascular conditions.
CAMS will continue to monitor the situation and provide updated forecasts as conditions evolve. The next update on air quality forecasts is scheduled for release on March 22, 2026. You can find more information and real-time data on the Copernicus Atmosphere Monitoring Service website.
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