Dust Level of SMT Floor

Obviously a totally clean floor is the best. So what if you have 1 particle of dust on your entire production floor? Is that 1 part per million (1 PPM)? or is that 1 part per billion? or 1 part per ???? How do you measure dust and come up with a PPM number?

It also depends on what you are producing. If you are building medical or aerospace equipment you probably need to be in a class 10,000 (or better) clean room. If building consumer electronics, sweeping/moping the floor 2-3 times a week may be good enough. At my company, we concentrate more on keeping the benches/shelves/equipment dust free than we do keeping the floor dust free.

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