I like spicy food, and my father in law cultivates different types of chili peppers for me, which I then process once dried.
It looks like the smaller the size of the chili pepper, the hotter it is. We normally have 3 degrees of heat level, which we call P, P+ and P++.
I have always used a dedicated grinder to grind the peppers, but my old grinder did not seal well, causing pepper dust to flow around. Needless to say that the job had to be done outside, when there was no wind, wearing appropriate eye-protection, gloves and a dust-mask.
Lately, I finally found a better grinder, which has a double seal, with a kind of extra gasket covering the container in which the peppers are grinded. The grinder can be used indoors without the risk that your home becomes uninhabitable for the next couple of days.