How are they getting AC filter so dirty?

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Here is a picture of AC filters from a duplex that I changed yesterday. A side was replaced at 2 months and B side at 3 months. What are your thoughts on what the tenants are doing on the A side to get the AC filter that dirty. Is it just the kids running in and out the backdoor bringing dirt in? I'm going to have to start changing the A side every month!

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@Mike Kirby

Let’s, time, kids, and they aren’t vacuuming or sweeping or swiffering etc ever. They’re either pigs in some way or ac happy. Either way filters are cheap like borscht, buy 12 and instruct to change them monthly.