What is Ammonia?
Ammonia is a gas (NH3) that dissolves in water to form ammonium hydroxide, a strongly alkaline solution. Household ammonia sold as a cleaner is usually 5–10%; the amount in a ready-to-use glass cleaner is often under 1%.
It also occurs naturally — it's in urine, fertiliser, and the smell of a neglected litter box — which matters for the mixing rule below.
What does it do in a product?
As a strong base it saponifies grease, turning it into a soap that rinses away, which makes it effective on stovetops, ovens, and oily glass. It evaporates completely, so it leaves no film or streaks — the reason it became the classic window-cleaner ingredient.
It is not a disinfectant. Ammonia cleans but doesn't reliably kill bacteria or viruses, which is where the temptation to add bleach comes from.
Is Ammonia safe?
Ammonia's toxicity is about concentration and air. Diluted household products used with a window open cause at most mild irritation. Concentrated ammonia, or diluted ammonia used in a closed bathroom, irritates the eyes, nose, throat, and lungs; people with asthma are more sensitive. Splashes of concentrated solution can burn skin and eyes.
The mixing hazard is the real risk. Ammonia + sodium hypochlorite (bleach) forms chloramine gases, which cause coughing, shortness of breath, chest pain, and at high exposure, pulmonary oedema. It doesn't take deliberate mixing: cleaning a litter tray or a urine-soaked carpet with bleach produces the same reaction, because urine contains ammonia. So does using a glass cleaner and then a bleach spray on the same surface.
Ammonia isn't carcinogenic and doesn't accumulate; the body produces and excretes it naturally. Environmental impact is low at household volumes.
Who should be careful
- Never use in the same room or session as bleach products
- Don't clean urine (pet or human) with bleach; use an enzymatic or ammonia-based cleaner instead, or clean the urine fully first
- People with asthma or COPD — use ammonia-free glass cleaners
- Small, closed spaces without ventilation
- On brass, aluminium, or marble, which it can damage
Regulatory status
| Region | Status |
|---|---|
| United States | Permitted in consumer cleaners. Labelling governed by the Federal Hazardous Substances Act; concentrated products require warnings. OSHA workplace exposure limit 50 ppm (8-hour). |
| European Union | Permitted. Solutions above 5% classified as corrosive and toxic to aquatic life; require hazard labelling and child-resistant closures at higher concentrations. |
| United Kingdom | As EU. |
| Canada | Permitted; Consumer Chemicals and Containers Regulations govern labelling. |
Where you'll find it
- Glass and window cleaners (many, though ammonia-free versions are common now)
- Multi-surface sprays
- Floor and tile cleaners
- Oven and grill degreasers
- Jewellery cleaners
- Some hair dyes (as an alkaliser — a different use)
Alternatives
- Vinegar-and-water for glass (streak-free, but never with bleach either — it makes chlorine gas)
- Alcohol-based glass cleaners
- Ammonia-free glass cleaners using surfactants
- Enzymatic cleaners for urine and pet messes
- Baking soda paste for oven grease
Is it in your product?
Paste the ingredient list or snap a photo of the label — IngredientIQ rates every ingredient in seconds.
Common questions
What happens if you mix ammonia and bleach?
Chloramine gas forms immediately. Symptoms — coughing, watery eyes, chest tightness — start within minutes. Leave the room, ventilate, and call poison control if you have breathing symptoms. In a closed space this can be a medical emergency.
Can I use bleach to clean cat urine?
Not until the urine is completely removed. Urine contains ammonia, and bleach on it produces chloramine. Use an enzymatic cleaner, which also removes the odour bleach can't.
Is ammonia a disinfectant?
No. It's a cleaner and degreaser but doesn't kill germs reliably. If you need to disinfect, clean with ammonia first, rinse, then use a disinfectant separately — never bleach in the same session.
Is the smell dangerous?
The smell is your warning system: ammonia is detectable well below harmful levels. If it's making your eyes water or you're coughing, the concentration is too high for the space — open windows and step out.
Related
Sources
- CDC / ATSDR, Toxicological Profile for Ammonia
- American Lung Association, Cleaning Supplies and Household Chemicals
- OSHA, Ammonia exposure limits
- Washington State Department of Health, Dangers of Mixing Bleach with Cleaners