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Types of particles that your HEPA filter should catch include: Pollen: 10-100 microns Pet dander: 0.5-100 microns Dust: 0.5-100 microns Fungal spores: 2-100 microns Tree and grass pollen: 20-30 microns Ragweed pollen: 10-20 microns Mold spores: 2-20 microns Bacteria: 0.5-5 microns What Particle Sizes Cant a HEPA Filter Catch

In all three cases, the Court explored the questions that are raised when state statutes or common law causes of action impose requirements that conflict with federal laws

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