Indoor air quality in livestock buildings directly affects respiratory health and welfare, with ammonia and particulate matter causing chronic damage at concentrations commonly found in commercial housing.
Air quality is an invisible welfare threat in livestock buildings that is easily overlooked compared to more visible welfare indicators. Chronic low-level ammonia exposure causes progressive respiratory damage that reduces immune function and increases disease susceptibility. Animals in buildings with poor air quality may appear normal to casual inspection while experiencing significant respiratory distress. Welfare assessment protocols that include air quality measurement provide a more complete welfare picture than behavioral observation alone. Ventilation investment and litter management are cost-effective welfare interventions with simultaneous productivity benefits.