... outdoors.Environmental measurements were collected during the morning routines in the stable such as cleaning stalls,feeding, cleaning and training horses. The samplingpoints were both in the stalls during ... three times; first in the winter, second in the interjacent late summer and the thirdtime in the following winter stabling period. The stable measurements included levels of ammonia,hydrogen sulphide, ... were increased duringwinter stabling conditions, with the latter well above lev-els reported to induce systemic white blood cell reactions in people. The compliance of the personnel in completingdiaries...