Ammonia is one of the most widely produced chemicals in the world, and its uses stretch far beyond the cleaning products most people associate it with. About 88% of ammonia consumed in the United States goes toward agriculture, but the remaining share powers an enormous range of applications, from manufacturing plastics to treating drinking water to fueling new energy technologies.
Fertilizer and Agriculture
The single largest use of ammonia is feeding crops. Nitrogen is essential for plant growth, and ammonia is the most efficient way to deliver it to soil. Farmers either apply liquid ammonia directly into fields or use it in processed forms like urea, ammonium nitrate, ammonium phosphates, and ammonium sulfate. These are, in that order, the major ammonia-derived fertilizers produced in the United States. Without synthetic ammonia, modern agriculture simply could not produce enough food to support the global population.
Direct application of anhydrous (pure, water-free) ammonia is common in large-scale farming. It gets injected into the ground, where it binds to soil moisture and slowly releases nitrogen to plant roots over weeks. Processed forms like urea pellets are easier to handle and store, which makes them popular for smaller operations and international trade.
Household and Industrial Cleaning
Ammonia is a powerful degreaser and streak-free cleaner, which is why it shows up in window sprays, floor waxes, and all-purpose cleaning solutions. Household products typically contain between 5% and 10% ammonia, while industrial-strength cleaners can go as high as 25%. At household concentrations, it cuts through grease, grime, and fingerprints on glass, stainless steel, countertops, and tile effectively.
There are a few important limits. Ammonia is corrosive to skin, eyes, and the respiratory tract, so using it in well-ventilated spaces matters. It can damage certain surfaces too, including hardwood floors, natural stone like marble and granite, and anything with a lacquer or varnish finish. You should also never mix ammonia-based cleaners with bleach. That combination produces chloramine gas, which is toxic even in small amounts.
Chemical Manufacturing
A huge portion of industrial ammonia never reaches a farm or a cleaning bottle. Instead, it serves as a building block for other chemicals. Nitric acid, one of the most important industrial chemicals, is made by oxidizing ammonia. Nitric acid then goes into everything from fertilizers to explosives to metal etching.
Ammonia is also a precursor for plastics and synthetic fibers. Nylon, one of the most common synthetic fabrics, depends on ammonia-derived chemicals during production. Polyurethanes, used in foam cushions, insulation, and coatings, similarly trace back to ammonia. The same goes for many dyes, pharmaceuticals, and the ammonium nitrate used in mining explosives. In short, ammonia sits upstream of a remarkable number of everyday materials.
Water Treatment
Many municipal water systems use ammonia as part of their disinfection process. When ammonia is added to chlorine, it forms compounds called chloramines. Unlike chlorine alone, which breaks down relatively quickly, chloramines provide longer-lasting disinfection as water travels through miles of pipes to reach your tap. This makes them especially useful in large distribution networks where water might sit in pipes for hours or days before someone turns on a faucet.
Chloramination also produces fewer of the disinfection byproducts that can form when chlorine reacts with organic matter in water. This is one reason the EPA recognizes chloramines as a standard secondary disinfection method for drinking water systems across the country.
Refrigeration and Cold Storage
Before modern synthetic refrigerants became widespread, ammonia was one of the original cooling gases, and it never really went away. Large-scale refrigeration systems in food processing plants, cold storage warehouses, and ice rinks still rely on ammonia because it is extremely efficient at absorbing heat. It also has zero ozone depletion potential and zero global warming potential, which makes it more environmentally friendly than many alternatives. The trade-off is that ammonia is toxic at high concentrations, so these systems require careful engineering and leak detection.
Medical and Athletic Uses
Smelling salts, one of the oldest medical tools still in use, work because of ammonia. When you crack open a capsule and hold it near someone’s nose, ammonia gas irritates the membranes of the nose and lungs. This triggers an inhalation reflex that increases both the rate and depth of breathing, which can restore alertness. It is specifically an inhalation reflex, not a startle response. The improved airflow to the lungs raises oxygen intake and can help rouse someone who has fainted.
Athletes, particularly powerlifters and football players, use smelling salts before big efforts for the same reason: that sharp burst of deeper breathing creates a brief spike in alertness and focus. In clinical settings, blood ammonia levels are also measured as a diagnostic tool, since elevated ammonia in the blood can signal liver disease or certain metabolic disorders.
Ammonia as a Future Energy Carrier
One of ammonia’s newer roles is as a way to store and transport clean energy. Hydrogen is widely seen as a carbon-free fuel, but it is notoriously difficult to store. It needs to be compressed to extremely high pressures or cooled to minus 253°C to become liquid. Ammonia sidesteps most of those problems. It liquefies at a far more manageable minus 33°C at normal pressure, and liquid ammonia packs about 45% more energy into the same volume than liquid hydrogen (3.83 MWh per cubic meter versus 2.64 for liquid hydrogen).
The idea is straightforward: use renewable electricity to produce hydrogen, convert that hydrogen into ammonia for shipping and storage, then either burn the ammonia directly as fuel or crack it back into hydrogen at the destination. Maritime shipping is a leading candidate for direct ammonia combustion since ships already have the infrastructure for handling liquid fuels in bulk. Several pilot projects are testing ammonia-powered ship engines right now, and many energy analysts consider ammonia a critical link in building a global clean hydrogen supply chain.
Safety Basics Worth Knowing
Ammonia’s usefulness comes with real hazards. It is a corrosive gas at room temperature, and exposure affects the skin, eyes, mouth, and lungs. The federal workplace exposure limit is 50 parts per million averaged over an eight-hour shift, and concentrations of 300 ppm are considered immediately dangerous to life or health. At household cleaning concentrations, the risks are manageable with basic precautions: good ventilation, gloves, and keeping it away from your eyes. At industrial concentrations or in enclosed spaces, ammonia requires serious safety protocols and protective equipment.