Ventilation and Air Quality in Livestock Housing

Air quality in livestock buildings significantly affects respiratory health, welfare, and performance — poor ventilation causes chronic suffering and disease in millions of animals.

Key Facts

Ammonia from urine decomposition reaches harmful levels in poorly ventilated pig and poultry buildings
Dust in poultry buildings carries pathogens and irritates respiratory tracts
Recommended maximum ammonia levels for pig and poultry welfare are 20-25 ppm; poorly managed buildings often exceed this
Natural ventilation in well-designed buildings can be as effective as mechanical ventilation
Respiratory disease is one of the leading causes of welfare loss and economic cost in pig production

Welfare Considerations

Poor air quality is a chronic welfare problem in many livestock buildings. Ammonia at elevated concentrations causes respiratory irritation, eye damage, and immune suppression in all species. In poultry, dust and ammonia combine to create conditions that predispose to respiratory disease. Monitoring ammonia levels and intervening when thresholds are exceeded protects both animal welfare and production performance. Natural ventilation design can significantly reduce ammonia accumulation without mechanical costs. Litter management, lower stocking density, and good building design are the most effective preventive measures.

What You Can Do

Support certification standards that require air quality monitoring and maximum ammonia limits
Advocate for ventilation and air quality standards in livestock building licensing
Choose products from producers with documented air quality management protocols
Support research into cost-effective ventilation solutions for different livestock housing types
Engage with air quality as a welfare indicator that can be monitored and improved systematically