Intensive pig farming generates significant air quality problems through ammonia and hydrogen sulphide emissions that harm human health, environmental quality, and pig welfare simultaneously.
Intensive pig production air quality problems create a rare instance of genuine alignment between animal welfare, human health, and environmental protection. The same ammonia and odour that damages community quality of life and contributes to environmental nitrogen pollution also damages pig respiratory health and welfare inside the barn. Ventilation improvements, dietary modification to reduce nitrogen excretion, and improved slurry management benefit all three outcomes simultaneously. This alignment provides a strong policy argument for emission reduction standards that are more commonly framed as environmental regulation but have direct animal welfare co-benefits that deserve explicit recognition.