where G is the aerosol production rate,a is the wall deposition rate of the incense particle, and A, is the air ventilation rate in min-', respectively. The incense aerosol production rate was determined by modeling the aerosol concentration profile with time. A polynomial function was used for the time-dependent generation rate. Equation 4 can be solved with the initial condition that t = 0, C= 0,leading to the analytical solution: