The invention relates to a method for determining the non-volatile component of aerosol particles in a gas sample, especially in the exhaust gas of internal combustion engines, where the aerosol particles are deposited on an oscillating sensor (2) of at least one crystal microbalance (3), and the change in at least one oscillation parameter of the oscillating sensor is employed as measurement variable. According to the invention the oscillating sensor (2) of at least one crystal microbalance (3) is maintained at a temperature of more than 200 C. during deposition of the aerosol particles, and preferably between 250 C. and 350 C.