Ammonia is a specific air pollutant. It is a colourless gas with strong smell.
Basic ammonia sources are the chemical industry, refrigerator installations and agriculture.

Impact on human health
Ammonia may cause irritation of the skin, eyes, nose, throat and lungs. High concentration liquid ammonia may cause blindness in the case of eye contact.
Long-term exposure to high concentrations should be avoided for prevention of ammonia adverse effects.

The following LVs for ammonia content in the atmospheric air have been adopted Regulation No. 14 (State Gazette No. 88/1997, amended SG No. 46/1999, amended and supplemented, SG No. 8/2002). - maximum single exposure LV - 0,25 mg/m3;
- 24 hour average LV (for 24-hour exposure) - 0,1 mg/m3.