Burning incense and joss paper at home or in temples are common Oriental religious practices. Believers consider that these practices will bring both their ancestors and themselves peace and blessings. However, the adverse effects of these practices on air quality and human health have become a concern recently. Ho et al.(2016) found that burning joss paper had relatively lower contributions to the mass concentration, while its contribution to cancer risk was larger than that of traffic emissions for some samples. He et al. (2018) indicated that pregnant women who frequently smelled the burning of incense in late pregnancy were associated with a higher risk of hypertensive disorders and higher levels of blood pressure before delivery, compared to those that did not burn incense. Even the products marketed as being environmentally friendly have been found to produce higher total concentrations of non-volatile polycyclic aromatic hydrocarbons (PAHS) and some oxygenated polycyclic aromatic hydrocarbons (OPAHS), while emitting a lower mass of PM2.5 particulates than do traditional incenses. These PAHS and OPAHS are strongly correlated with inflammatory responses (Lni et al., 2016). The problem is particularly severe because of worshippers' high concentrations of PM2.5, PM10, and PAHS exposure (Lung and Kao, 2003; Lung et al., 2003). Some exposure even occurs indoors.