Ammonia in Animal Housing: Welfare and Health Effects

How ammonia from animal waste accumulates in livestock buildings and causes respiratory, eye, and welfare problems for both animals and workers.

Key Facts

Ammonia concentrations in intensive poultry and pig houses can reach 100+ ppm in poorly managed conditions
EU welfare legislation sets maximum ammonia limits of 20 ppm for pigs and 10 ppm for poultry
High ammonia causes ocular damage, respiratory disease, and behavioral avoidance in poultry and pigs
Ammonia also contributes to atmospheric nitrogen pollution affecting natural ecosystems
Good litter management, ventilation, and housing design are the primary ammonia control measures

Welfare Considerations

Ammonia is a chemical indicator of poor air quality in livestock buildings. At the concentrations common in poorly managed intensive housing, it causes direct welfare harm through ocular irritation (conjunctivitis, corneal damage), respiratory inflammation, and behavioral changes as animals try to avoid the highest concentration areas. Chronically elevated ammonia also suppresses immune function and increases respiratory disease susceptibility. Good ammonia management through adequate ventilation, litter management, and appropriate stocking density protects both animal welfare and farmer respiratory health.

What You Can Do

Support welfare certification that includes maximum ammonia concentration standards
Advocate for mandatory air quality monitoring in intensive livestock housing
Choose products from farms demonstrating good litter management and ventilation
Support research into low-ammonia feed formulations
Raise ammonia as a welfare and environmental issue in livestock farming debates