For 23 types of incense that were tested for particulate matter emissions using the cycloney
filter method, PM emission rates ranged from 7 2.5 to 202 mgyh, and PM emission factors ranged 2.5
from 5 to 56 mgyg of incense burned. Particles generated by the burning incense were typically
less than 2.5 mm in aerodynamic diameter, except for some larger particles generated by the rocks
charcoal type of incense.