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I recently found this blog post about an effective DIY air filter - explicitly filters pm2.5

I built one (< $50) and I'm pretty happy with the results. As someone with a life long sensitivity to air quality, the air definitely feels cleaner.

You really don't need to DIY unless you really want to. My non-DIY mass produced air filter from Home Depot can filter PM2.5 too.

Different strokes. I've been disappointed by every commercial air purifier I've ever bought - expensive and unreliable.

The blog is persuasive and provides a full air quality analysis. It's cheap and effective, a potent combination.