Respirators that filter dust cannot protect wearers in toxic chemical environments, such as manure pits, silos, or sludge tanks. Wearing a respirator equipped with a dust filter in these conditions can be fatal. However, respirators can reduce exposure to farm dust and may prevent serious respiratory problems. Wearing a respirator, even if it does not fit correctly, is better than wearing none at all. Most people cannot tell when a respirator fits properly.
Most respirators used in farming activities supply fresh oxygen.
A respirator with a chemical cartridge is appropriate to use when cultivating in the wind. See answers at the end of this document. Determine proper respirator for the job. Check the label or with a professional if you have questions. Compare the cost of disposable and non-disposable respirators.