Where C is the pollutant concentration (mg/m3) in the chamber, E is the emission rate (mg/h), V is the volume of the chamber (m3), Cmax is the maximum pollutant concentration (mg/m3) in the chamber, i.e., the concentration at the time when fire was extinguished, k is the pollutant removal rate (h-1), t is time (h): t = 0 when the fire was started; t = T when the fire was extinguished.
The burning rate B (g/h) was easily obtained from amount (g) of incense burnt and the duration (h) of the burn, the emission factor Ef (mg/g) can be calculated using the following equation: