A mosquito net is a type of meshed curtain that is circumferentially draped over a bed or a sleeping area, to offer the sleeper barrier protection against bites and stings from mosquitos, flies, and other pest insects, and thus against the diseases they may carry.
As a tent-like covering over a bed, it is important that the netting not have holes or gaps large enough to allow insects to enter. The Mosquito nets or tulle canopy are usually made of warp-knitted nylon tulle which meshes eye at 0.8mmx0.8mm, it is too small, so it may filter out some dust, especially the larger particles. It may not be perfect, but I would say it is the best product for filtering out dust while still letting in the breeze.

Mosquito Nets & Canopy in three sizes, Twin/Twin XL (68" x 86"), Full/Queen (88” x 92”) and King/Cal King (106” x 92”).