Microcryst. cellulose and microbiol. chitosan were added (up to 3%) to polypropylene matrix (melting flow index 1200 g/10 min) processed to composite nonwovens by melt-blown technique. The nonwovens were studied for hydrolytic degradability at 65 degrees C (pH 7), ay. mol. mass (viscosimetry) and photodegradability (25 W/m(2) for 5-240 h). The addn. of fillers resulted in increasing the air permeability and in decreasing the mech. strength of the polypropylene matrix. The accelerated hydrolytic (21-84 days) degradn. of the composites resulted in mass loss (up to 3.5%) and a decrease in molecular mass (up to 2%) of the polypropylene matrix. The photolytic degradn. (40-160 h) resulted in a decrease in molecular mass of the matrix up to 8%.