Emissions of ammonia from livestock farming are responsible
for the acidiAzcation and eutrophication of deposited
ammonia in the environment. Research into the
ammonia emission from livestock houses was carried out
in 14 housing types for cattle, pigs and poultry in England,
The Netherlands, Denmark and Germany. Concentrations
of ammonia and carbon dioxide (the latter for estimating
ventilation rates) were measured at seven locations
inside and one location outside in four replicates of each
housing type over 24 h under summer and winter conditions.
Mean concentrations and emissions per housing
type per country were estimated together with some variance
components. Mean ammonia concentrations were
lower than 8 p.p.m. in cattle houses, between 5 and
18 p.p.m. in pig houses and between 5 and 30 p.p.m. in
poultry houses. The concentrations of ammonia in a number
of pig and poultry houses exceeded the threshold value
of 25 p.p.m. and may aA