Lower-temperature combustion, such as tobacco smoking or wood-burning, tends to generate low molecular weight PAHs, whereas high-temperature industrial processes typically generate PAHs with higher molecular weights.
As temperaturas de combustión baixas, como as acadadas ao fumar tabaco ou queimarse os bosques, tenden a xerar HAPS de baixo peso molecular, mentres que os procesos industriais a alta temperatura xeran normalmente HAPs de maiores pesos moleculares.