Results of continuous measurements of dust during 24 hours on 22 days in one round and of behavioural investigations at the same time have shown a high correlation of both parameters (dust concentration; locomotoric activity of fattening pigs) over a 24 hour-cycle with biphasic dynamics (two phases with increased values: after morning feeding between 7 and 9 a.m. and in the afternoon between 1 and 3 p.m.). The hour-averages of both variables (n = 528) demonstrated a highly significant positive correlation (r = 0.73; p < 0.01); dust concentration is increasing with increasing animal activity. It is necessary to consider the dynamics of dust values over 24 hours in measuring and evaluating concentration or emission of dust under the aspects of animal and environmental hygiene. A reduction of dust concentration up to 18% is possible by using an aerosol-application of soybean oil-emulgator over 24 hours with an amount of 80-85 ml per square meter and 24 hr.