Impact of particulate matter and ammonia on average daily weight gain, mortality and lung lesions in pigs

In the univariable model, increasing PM10 concentrations resulted in a higher odds of pneumonia lesions (second half of the FP: OR = 8.72; P = 0.015), more severe pneumonia lesions (FP: P = 0.04, second half of the FP: P = 0.009), a higher odds of pleurisy lesions (FP: OR = 20.91; P < 0.001 and second half of the FP: OR = 40.85; P < 0.001) and a higher number of nPCR positive nasal samples (FP: OR = 328.00; P = 0.01 and second half of the FP: OR = 185.49; P = 0.02). Increasing NH3 concentrations in the univariable model resulted in a higher odds of pleurisy lesions (FP: OR = 21.54; P = 0.003) and a higher number of nPCR positive nasal samples (FP: OR = 70.39; P = 0.049; second half of the FP: OR = 8275.05; P = 0.01). In the multivariable model, an increasing PM10 concentration resulted in a higher odds of pleurisy lesions (FP: OR = 8.85; P = 0.049). These findings indicate that the respiratory health of finishing pigs was significantly affected by PM10.