Factory Farming Is Polluting The Air We Breathe

The UK’s worst ammonia pollution hotspots correlate with factory farms. That should surprise absolutely nobody.

When you cram thousands, tens of thousands, or hundreds of thousands of animals into industrial units, the waste does not vanish. It piles up. It is stored. It is spread. It leaks into rivers. It rises into the air. It reacts with other pollutants. It becomes everyone else’s problem.

That is what factory farming does. It concentrates animals as units of production, then concentrates the waste, disease risk, pollution, smell, noise, emissions, and misery around them.

According to the new Ammonia Map from Compassion in World Farming and Sustain, the UK areas with some of the highest ammonia pollution overlap with regions dominated by intensive chicken and pig farms. North Herefordshire, Gainsborough, surrounding areas, and Norfolk all stand out. Norfolk alone releases more than 11,700 tonnes a year.

This is not a minor side issue. In 2024, agriculture was responsible for 89% of the UK’s total ammonia emissions. Most of that came from farmed animals, their waste, and fertiliser. Globally, livestock production and fertiliser use account for more than 80% of ammonia emissions. So when the industry talks about “food production”, we should be very clear about what is being produced. Ammonia. Particulate pollution. River damage. Respiratory disease. Cancer risk. Dead zones. Soil acidification. Rural communities forced to live beside industrial waste systems.

Ammonia itself is a nitrogen-based gas. Nitrogen is essential for life. That is the industry-friendly line. But once ammonia is released into the air, it stops being a useful plant nutrient and becomes a dangerous pollutant. It reacts with other pollutants to form PM2.5, tiny particles small enough to enter the lungs and bloodstream. PM2.5 is one of the most dangerous forms of air pollution. Short-term exposure is linked with respiratory symptoms, asthma, cardiac arrhythmias, and cardiovascular events. Long-term exposure contributes to chronic bronchitis, reduced lung development in children, lung cancer, and premature death. Emerging evidence also links long-term exposure with type 2 diabetes, cognitive impairment, neurodevelopmental disorders, dementia, premature birth, low birthweight, and possible links to sudden infant death syndrome.

This is what people are being asked to accept so others can keep eating animals.

And this pollution does not politely stay next to the farm. Ammonia travels. CIWF notes that in 2023, UK agriculture contributed 38% of particulate pollution in Leicester, 32% in Birmingham, and 25% in London.

The public is often told factory farming is hidden because people would not like what happens to the animals inside. That is true. But it is also hidden because the model is disgusting at every level. Inside these units, animals are confined in crowded indoor systems where waste accumulates and ammonia builds up. That air irritates their eyes and respiratory systems. They are forced to breathe the pollution before it reaches anyone else. The same system that treats them as commodities also turns their bodies and waste into a public health burden.

This is not just about “bad practice”. It is the predictable result of turning sentient beings into production units. The UK already has a river pollution scandal. Water companies have rightly been condemned for dumping sewage into rivers. But animal agriculture is not some innocent bystander. Agricultural runoff is the single biggest polluter of UK rivers, responsible for around 40% of damage to waterways. A River Action report found widespread breaches of pollution regulations on dairy farms, with 69% of inspected farms in England and 80% in Wales found non-compliant. A herd of 50 cows can produce the pollution equivalent of a human settlement of 10,000 people.

Imagine a town of 10,000 people dumping its waste into the environment and calling it lunch.

Now add the air pollution.

Now add the manure storage.

Now add the slurry spreading.

Now add the ammonia.

Now add the fact that the UK government is reportedly considering planning changes that could make it easier to build more factory farms. Documents obtained by the Guardian showed years of poultry industry lobbying to ease planning rules for intensive livestock units. Proposed changes could make environmental refusals harder, limit local authority powers, and give more weight to “domestic food production”.

Of course they call it food security. They always do.

But there is nothing secure about a system that depends on imported feed, imported vitamins, massive disease vulnerability, weakened ecosystems, collapsing rivers, polluted air, and communities forced to live near industrial animal waste. That is not food security. That is pollution with a marketing department.

There is also a growing human health picture that should make politicians pause before handing the industry easier planning rules. A 2026 Environmental Research study found that higher county-level exposure to animal feeding operations, including concentrated animal feeding operations, was associated with increased all-cancer incidence across California, Iowa, and Texas. The authors were careful not to claim individual causation, but the associations were there, with stronger links for bladder cancer in California, colorectal cancer in Iowa, and lung and bronchus cancer in Texas.

Factory farms emit ammonia, hydrogen sulphide, particulate matter, volatile organic compounds, bioaerosols, and contaminated runoff. They can pollute air and water at the same time. Communities near them are often expected to absorb the consequences while the industry collects the money. That is the real story. Factory farming is not simply an animal issue, although the animals alone are enough reason to oppose it. It is also an air issue, a river issue, a climate issue, a worker issue, a child health issue, a rural community issue, and a political corruption issue. The industry wants the public to see meat, milk, and eggs as neat supermarket products. Look closer.

Behind them are sheds full of trapped animals, rivers carrying waste, fields sprayed with slurry, lungs filling with particles, and governments treating industrial animal production as something to protect rather than phase out.

Ammonia may be invisible.

The injustice is not.