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Celestron UHC (Ultra High Contrast) Light Pollution Reduction 48mm Filter (Fits 2" Ey 94124B&H Photo$22.99
Nose Filter Reusable Breathable Nasal Plugs Air Filtration for Dust, Pollution, Block Cold Air (High-end Type, 3EA, Large)Amazon$24.00
FIBONAX Ultra High Contrast UHC 1.25 inch telescope filter,Eliminates light pollution, Improves astrophotography contrast, Aluminum alloy frame, Stackable filter structure, Astronomical componentsAmazon$399.99
Mila Air Purifier with Basic Breather Filter (H12 HEPA), High-Performance Filter for Smoke, Allergens, Dust, Pollution & Pet Dander, 447 CADR, 1,000 sq ft Coverage, 12”x12”x15”, WhiteAmazonSAVE $1.04
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SOURCE Outdoor Helix Valve Kit - High-Flow Helix Bite Valve For Full Flow with Just a Soft Bite - Easy connection via QMT Quick Connect Mechanism - Dirt Shield Protects from Dust and Pollution, CoyoteAmazon