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From her home in Donaldsonville in the southern US state of Louisiana, less than three miles from the world’s largest ammonia plant, Ashley Gaignard says the air itself carries a chemical edge.

The odour, she said, is sharp and lingering. Years ago, when her son attended a school about a mile from the massive CF Industries ammonia production facility, he would begin wheezing during breaks from class, she recalled. His breathing problems eased only after he transferred to a school several miles farther away.

“I’m not against progress,” Gaignard said. “We are against development that poisons and displaces and disregards human life.”

Now, along Louisiana’s Mississippi River corridor, fertiliser giant CF Industries and other companies are placing multibillion-dollar bets on “blue ammonia” — a product made from fossil fuels but with extra technology to capture planet-warming gases and pipe them underground for storage.

To date, no commercial-scale blue ammonia plants are operating — but more than 20 have been proposed nationwide, according to Oil and Gas Watch. Four of the largest such plants are slated for Louisiana, in communities already saturated with petrochemical pollution.

An extensive review by Floodlight found no evidence that existing carbon capture projects anywhere in the world have achieved anything close to the emissions cuts companies like CF Industries are promising. Permit documents, meanwhile, show that the proposed plants combined could be allowed to discharge more than 2,800 tons each year of air pollutants (not greenhouse gases), including more than 400 tons of ammonia.

Classified as a highly hazardous chemical, ammonia can damage the lungs and hurt the skin, eyes and throat. In the air, it can form fine particles that are linked to increased risks of heart disease and stroke, and can be deadly — particularly for children, older adults and people with heart or lung disease.

The Louisiana plants would also be allowed to release carcinogens, including benzene and formaldehyde.

The companies proposing those plants — CF Industries, Air Products, Clean Hydrogen Works and St. Charles Clean Fuels — have said their operations will provide an abundant source of clean fertiliser and clean energy to global markets, including countries whose climate and trade policies favor low-carbon fuels. They’ve also said they’ll create nearly 840 permanent jobs and millions in new tax revenue for local communities while prioritising public health and safety.

“We are designing the facility with advanced emissions controls, robust monitoring systems, and strong operational practices to minimise impacts,” said Chandra Stacie, the director of community relations for St. Charles Clean Fuels. “Our goal is to operate responsibly and be a constructive, long-term partner.”

Environmental advocates, scientists and community members, however, say the new ammonia plants would delay the phase-out of fossil fuels — and bring substantial air pollution and safety risks to places that have long borne the health costs of America’s industrial economy.

Why Louisiana became ground zero

While the historic streets of Donaldsonville recently served as the backdrop to the 2025 blockbuster Sinners, the town’s real-life drama is far less cinematic.

Donaldsonville lies at the center of Cancer Alley, a chemical corridor between Baton Rouge and New Orleans known for its elevated health risks and dense concentration of petrochemical plants and refineries.

Now this stretch of Louisiana is also ground zero for a new buildout: four proposed blue ammonia plants, with several more planned for Texas.

So, why the Gulf Coast?

South Louisiana has abundant natural gas for ammonia production and ports that connect to international shipping routes.

The state offers an existing pipeline network, a seasoned chemical-industry workforce and political leaders who have consistently favored industrial development. The companies proposing ammonia plants can also tap generous state and federal incentives, including more than $2 billion in federal tax credits for carbon capture projects.

The Inflation Reduction Act, former President Joe Biden’s signature climate law, allows companies to collect up to $85 for each ton of carbon captured and permanently stored.

And the state of Louisiana is offering developers millions more in grants and tax breaks designed to spur economic development.

Mark Jacobson, a professor of civil and environmental engineering at Stanford University who has studied carbon capture systems for years, said there’s little to be gained — and much to lose — from making ammonia this way.

“These plants increase air pollution, they increase global warming … they increase not only energy costs, but total social costs, and so there’s zero benefit — except to the people who are taking the subsidies to implement these projects,” he said.

The scale of subsidies for the proposed Louisiana ammonia plants is “off-the-charts outrageous” — and amounts to a bad deal for taxpayers, said Greg LeRoy, executive director of Good Jobs First, a nonprofit that tracks and analyzes economic development projects. The plants are unlikely to deliver anything close to $2 billion a year in public benefits, he said.

“It can only be accurately called a massive transfer of wealth from U.S. taxpayers to corporate shareholders,” he said.

Ambitious pitches, tougher reality

Ammonia has long been a workhorse of the global economy, quietly underpinning modern agriculture. It’s the key ingredient in nitrogen fertiliser, and demand is expected to grow as global food production strains to keep pace with population growth.

Now, producers say it could play a far larger role — not just as fertiliser, but as a climate-friendly fuel for ships and power plants.

When it’s burned as a fuel, ammonia doesn’t emit carbon dioxide (though it can produce nitrous oxide, a greenhouse gas roughly 270 times more potent than carbon dioxide).

It can also be burned with other fuels in power plants or potentially used to store hydrogen for shipping and later conversion for use in fuel cells.

But the process commonly used to make ammonia carries a heavy climate cost.

Most production relies on hydrogen derived from natural gas, a process that releases carbon dioxide. Enormous amounts of energy — typically from fossil fuels — are then used to force hydrogen and nitrogen to combine under extreme heat and pressure.

Nitrogen fertilizer plants in the U.S. released more than 46 million tons of heat-trapping gases in 2021 — roughly the emissions of nine million cars running for a year — according to a report by the Environmental Integrity Project. Globally, almost 2% of carbon dioxide emissions come from making ammonia — or as much as the energy system emissions of South Africa, according to the International Energy Agency.

That’s where carbon capture comes in. The companies planning blue ammonia plants say they will isolate most of the carbon dioxide released, piping it deep underground for permanent storage.

Texas-based Clean Hydrogen Works says its Ascension Clean Energy project, slated for Donaldsonville, will produce up to 7.2 million tons of ammonia annually and will capture “up to 98 percent” of the carbon dioxide produced.

Nearby, CF Industries and the Pennsylvania-based Air Products plan to build two plants they say will have capture rates of 95% or more.

About an hour to the east, the St. Charles Clean Fuels project would capture more than 99% of carbon dioxide generated, its developer says.

Those claims are unlikely to hold up, said Cornell University professor Robert Howarth, an expert on greenhouse gas emissions and ammonia pollution.

“Is the industry correct in saying that they can produce a really, really low emissions fuel using natural gas as their original feedstock?” he asked. “The answer is no. It’s just never been done, and I don’t think it can be done.”

The majority of existing carbon capture facilities trap less than 60% of carbon dioxide, according to a 2023 review by the Institute for Energy Economics and Financial Analysis. “No existing project has consistently captured more than 80% of carbon,” the institute found.

Blue hydrogen — a prerequisite for blue ammonia — “is neither clean nor low-carbon,” and pursuing it would divert time and money from more effective climate solutions, the institute concluded.

In an email to Floodlight, Air Products spokesperson Christina Stephens said the company is “very confident in our proprietary technology that allows us to capture 95 percent of the CO2 emissions.” She did not elaborate.

Stacie, the St. Charles Clean Fuels representative, said its facility’s design will be “conducive to high capture rates.”

Experts also note that carbon capture itself is typically powered by natural gas, adding emissions and undercutting its climate benefits.

Compounding the problem are emissions of methane, a far more potent greenhouse gas than carbon dioxide. Methane is frequently emitted during drilling, processing and transport of natural gas. More escapes in the process used to extract hydrogen for ammonia production.

Total methane emissions from the fertilizer industry could be more than 140 times higher than official estimates, one 2019 study found.

Stephens, the Air Products spokesperson, said the company believes previous research related to methane leakage has flaws that led to inaccurate conclusions.

Stacie, meanwhile, said St. Charles Clean Fuels will monitor and verify methane emissions through “operations control and third-party verification consistent with emerging best practices.”

The local cost of a global fuel

Even if blue ammonia plants deliver the climate benefits their backers promise — benefits that experts dispute — their local impacts could still be substantial.

In 2024, the CF Industries Donaldsonville plant — near Gaignard’s house — released more toxic air pollutants than all but one other industrial site nationally, according to EPA data. The 7.1 million pounds of ammonia the plant released that year would more than fill the New Orleans Superdome, according to Kimberly Terrell, a research scientist for the Environmental Integrity Project.

Emissions from the planned blue ammonia plants could worsen respiratory health, Terrell said, with impacts extending far beyond the plant sites.

“I would be concerned about increasing asthma rates long term,” she said.

Ascension Parish, where three of the proposed blue ammonia plants would be built, hosts more than two dozen industrial facilities and already has the second highest amount of air emissions in the country, according to EPA data.

So the prospect of new ammonia plants in Ascension Parish worries Twila Collins.

She has lived her entire 55-year life in Modeste, a historic, predominantly Black community along the Mississippi River. If CF Industries gets its way, a massive ammonia plant would rise roughly a mile from her home.

Her message for the company is blunt: “Leave us alone and find somewhere else to go where there’s nobody living, so you won’t disrupt a community.”

Industrial pollution already drifts into her neighborhood, bringing smells “like a landfill,” she said, and a new ammonia plant would add another layer of pollution — and another set of health risks.

In a 2024 report, CF Industries said its employees “regularly maintain, replace, and update equipment” to reduce emissions.

But under its draft permit for the Blue Point plant, the company would be allowed to release more than 1,100 tons of air pollutants each year — equivalent to the weight of more than 27 fully loaded tractor trailers. That includes more than 140 tons of ammonia and more than 580 tons of carbon monoxide.

Collins said she can name more than 30 people in Modeste who suffer from cancer or respiratory problems. The issue is deeply personal. She herself has struggled with cancer. And in 2002, her 9-year-old son died of an asthma attack. He had struggled with asthma all his life, but Collins still wonders whether the industrial pollution surrounding Modeste helped trigger the attack that killed him.

She also worries about what could go wrong if something fails — an accident, a leak or worse — because ammonia production and carbon dioxide transport involve well-documented industrial risks.

CF Industries’ Donaldsonville plant has a history of deadly accidents: a 2000 explosion and fire killed three workers and injured at least eight others, and a 2013 blast killed one worker and injured eight more.

This past November, an explosion at another CF Industries plant in Yazoo City, Miss., led to an ammonia leak and prompted the evacuation of nearby residents.

Residents push back

While supporters emphasise the economic boost and high-paying jobs the projects could bring, many local residents have turned out at public hearings to oppose them.

So many people packed a hearing room on the St. Charles project in 2024 that it had to be canceled and rescheduled in a larger venue.

Some of the public fears have centered on the carbon dioxide pipelines that would be needed to make the projects work.

Air Products, for instance, has proposed piping millions of tons of carbon dioxide 38 miles to be stored a mile underneath Lake Maurepas. The project would be “the world’s largest permanent carbon dioxide sequestration endeavor to date,” according to the Louisiana Department of Economic Development.

At a November public hearing on the project, Air Products vice president Andrew Connolly said the company has an “unsurpassed safety record.”

“All pipelines will be monitored 24-7 and we will meet or exceed all pipeline regulations,” he said.

More than 300 people turned out for that public hearing, according to Dustin Renaud, a spokesperson for the environmental law group Earthjustice. Among the more than 50 people who spoke, all but three opposed the project.

Opponents have warned of what could happen if a carbon dioxide pipeline ruptures, as happened in 2020 in Satartia, Mississippi. That disaster sent 45 people to the hospital and left some residents unconscious in their homes and cars. Starved of oxygen, cars stalled or couldn’t start, making evacuation difficult.

The Air Products pipeline would run within half a mile of Sorrento Primary School, an elementary school in Ascension Parish with more than 600 students. An expert hired by Earthjustice concluded that a pipeline rupture could endanger the schoolchildren, along with residents of a nearby subdivision.

Stephens, the Air Products spokesperson, said the company will run the pipeline deeper than is required by code in the school’s vicinity. The pipeline will also have more shutoff valves than required, she said.

“We have a long safe history of operating the largest hydrogen pipeline network in the world right here in Louisiana,” she wrote.

Stacie, the St. Charles Clean Fuels representative, said the company will incorporate “detection systems, automated shutdowns, mechanical integrity programs and emergency response planning” — consistent with federal rules and “lessons learned from prior incidents.”

Still, some residents worry.

“We don’t have a good evacuation route,” said St. James Parish resident Gail LeBoeuf, who co-founded the environmental justice group Inclusive Louisiana. “If something would happen, we would just be stuck like Chuck.”

The companies behind the blue ammonia projects have said they will bring jobs and millions of dollars into the state economy — a message that has found a receptive audience in the state capital and some city halls.

CF Industries did not respond to Floodlight’s questions about its proposed plant, while Clean Hydrogen Works declined to answer questions.

Amid public opposition, Louisiana Governor Jeff Landry in October announced a moratorium on new carbon capture projects. The order halted the state’s review of new permits for projects that would inject carbon dioxide underground, while allowing existing applications to continue — including the blue ammonia projects already underway.

A lower-carbon alternative

There are cleaner ways to make ammonia.

Instead of extracting hydrogen from natural gas and then trying to capture the CO₂, producers can use renewable electricity to split water into hydrogen and oxygen. That “green hydrogen” can then be combined with nitrogen to make what’s known as “green ammonia.”

At least one large-scale green ammonia plant is already operating. In Chifeng, China, a facility powered by wind turbines and solar panels began industrial-scale production in 2025. By 2028, the plant is expected to produce 1.5 million tons of green ammonia annually.

In the U.S., developers have proposed green ammonia plants in Texas, Nebraska, Oklahoma and Washington.

“Instead of making this big labyrinth of pipes and equipment and sending CO2 everywhere and using more energy, you can simply produce that hydrogen with electricity from solar and wind,” said Jacobson, the Stanford professor.

In the debate over blue ammonia, the stakes are high.

For ammonia producers, the projects promise billions in federal tax credits and a foothold in emerging energy markets. They also offer oil and gas companies a way to delay the phase-out of fossil fuels, critics say.

“It’s a great way to lock in oil and gas infrastructure. … Something that we should be getting away from, as opposed to locking in for years and years to come,” said Alexandra Shaykevich, a research manager at the Environmental Integrity Project who tracks oil and gas projects.

For residents along Louisiana’s Cancer Alley, the stakes are more immediate. They’re being asked to live with new plants, new pipelines and new risks in places that have already absorbed decades of pollution.

But Gaignard plans to keep fighting for her community.

“I don’t look at this as red and blue and the left and the right,” she said. “We need to start looking at humanity.”

Floodlight is a nonprofit newsroom that investigates the powerful interests stalling climate action.

The post As Louisiana bets big on ‘blue ammonia’, communities brace for air pollution appeared first on Climate Home News.

As Louisiana bets big on ‘blue ammonia’, communities brace for air pollution