Microclimatic factors rendering gas emissions from manure were evaluated during the four seasons throughout a year. The most favorable microclimatic conditions for the highest bacterial activity which fostered the NH3 emissions from manure were observed in the insulated cowsheds. The temperature did not fall below 2.1ºC, whereas it rose up to 26.9ºC during summer, thus resulting in high air humidity. The most favorable microclimate is that of a cold cowshed: -14.1ºC to 29.5ºC, with the relative humidity fluctuating within the desirable limits even in the cold period. In a cowshed, the main air pollutant is NH₃; as for the other harmful gases, relatively low emissions were observed. The maximal rates of NH₃ emission were observed from surfaces littered with liquid manure as well as in loci where the urine accumulated. The highest NH₃ emission was observed from the floor littered with a liquid manure near the parlor – 342±21 mg·m^-2·h^-1 in a semi-deep cowshed. The following NH₃ emission factors per livestock unit (LU) per day (d) were estimated: box-type cold – 21.9±3.2 g (LU d)^-1, partially insulated box-type – 32.1±3.7 g (LU d)^-1, semi-deep cowshed – 30 8±4.3 g (LU d)^-1, and tie-cowshed – 27.4±2.9 g (LU d)^-1.