Chemical cartridges may also be considered as alternatives to N95 masks. Chemical cartridges are rated to protect against specific chemicals: organic vapors, ammonia, etc. There are also dual cartridges white function as both a chemical filter and a particulate filter. Any cartridges considered as protection against COVID-19 in addition to other uses must be able to filter dust. For some cartridges, you can add on a particulate filter as an attachment.