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If for some reason you are not given medical clearance, you are protected by the Worker Protection Standard. It is illegal for an employer to terminate employment, reduce pay, or punish an employee in any other way due to a failed respirator medical evaluation.

Filtering respirators, which remove solids and liquids suspended in air. These are much more commonly required on pesticide labels. If the label requires a filtering respirator, it will specify a letter and sometimes a number. In many cases, a label will say “Any NIOSH-approved N, R or P filter.” If this is the case, any 95, 99 or 100 filter will be acceptable. A100 filter will provide more filtration, but will also be harder to breathe through and could cause elevated blood pressure or difficulty breathing.

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Any respirator you wear should be NIOSH-approved. The National Institute of Occupational Safety and Health tests respirators to ensure they protect the wearer to the degree they claim to. It is the only trusted certifying agency or organization.

Choosing the right respirator starts with the label. Pesticide labels will typically require one of two main types of respirators:

Some agricultural pesticides require the applicator to wear a respirator. Keep yourself safe from inhalation hazards while using these products.

US EPA. 2015. Agricultural Worker Protection Standard (WPS): Comparison of the new protections to existing protections (PDF). https://www.epa.gov/sites/production/files/2015-09/documents/comparison-chart-wps.pdf

While respirators are meant to protect people, they can pose a health risk if you have high blood pressure, asthma, claustrophobia, etc. Wearing a respirator puts extra strain on your lungs and can cause your blood pressure to rise. As such, the National Institute for Occupational Safety and Health (NIOSH) tends to suggest the least invasive respirator needed to keep the wearer safe.

For quantitative fit testing, a sensor will provide a numerical reading on the amount of leakage into the respirator. As with qualitative testing, you’ll have to adjust your respirator or try new models and sizes until you find one with a sufficient rating for your face size and shape. Your fit testing provider will often have samples to try, and they can give you the details on where to buy the model you are fitted for.

Peter Knott, Terry Gorman. 3M Tech Update, 2012. Cleaning Re-usable Respirators (PDF). http://multimedia.3m.com/mws/media/473937O/3mtm-cleaning-reusable-respirators.pdf

Chemical Respirator3M

Pesticide Educational Resources Collaborative. 2017. Worker Protection Standard (WPS) Respiratory Protection Guide (PDF). http://pesticideresources.org/wps/hosted/PERC-WPS-Respirator-Guide.pdf

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For qualitative fit testing, you’ll wear your respirator under a hood. After determining you can taste the test agent, someone will pump a sweet or bitter-tasting substance into the hood and ask you to perform a variety of facial movements. If you can taste the substance, you’ll have to adjust your respirator or try a new model or size until you find one that prevents you from tasting the substance.

Ninety-eight percent of people will receive clearance through the online system; 2% will be instructed to see a health professional in person, and the online system will provide instructions for the health provider. This online exam takes approximately 35 minutes to complete.

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Cleaning and storage: After each use, remove the filters and cartridges. Clean your respirator with warm water (not exceeding 50 degrees C / 122 degrees F) with a simple detergent solution. Detergents should not contain lanolin or other oils. Using a soft brush can help to remove residues. After washing, soak your respirator with a disinfectant such as 30 mL household bleach, diluted in 7.5 L of water. Rinse in warm water and allow to air dry. Store your respirator away from contaminated areas.

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The Worker Protection Standard requires everyone using pesticides that require respirators to be fit tested annually, or when any change occurs to your face shape occurs (i.e. weight changes or traumatic accidents).

Chemical cartridges and canisters, which adsorb or absorb gases and vapors. Most pesticide labels with a cartridge requirement require an organic vapor or OV cartridge, color-coded black. Be sure to check the label closely as a few pesticide labels require a different cartridge type.

Regularly inspect your respirator for tears, cracks, distortion, dirt, missing parts or other damage. Inspect straps, inhalation and exhalation valves, and all other plastic parts of the respirator.

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Before you can wear a respirator or be fit tested to wear a respirator (see #3 for fit testing), you must pass a medical evaluation. Check with your local clinic to see if they offer this service. If not, evaluations can be done online. 3M's respirator team recommends respexam.com.

There are many respirator options on these distributor sites. If you know the type of filter you’re looking for, type the code into the search bar (e.g. “P100”). The description of the correct filter should list the corresponding half-face or full-face respirator.

Respirators can be purchased from the following sites. The University of Minnesota does not endorse any of the following.

The photo below shows four different types of respirators: two filtering facepieces, a half-face respirator, and a full-face respirator. All of these respirators can work as filtering respirators, but only the half-face and full-face respirators can carry a chemical cartridge. A fit test will help you determine which type of respirator is best for you. The half and full-face respirators can hold both cartridges and filters; other half and full-face respirators are available without cartridge attachments.

Changing filters and cartridges: under the Worker Protection Standard, respirator filters and cartridges should only be worn for eight hours. If you only wear your respirator for a few hours at a time and want to wear it again later, keep it in a clean place away from where your pesticides are stored. If you are using an organic vapor cartridge, keep it in a sealed plastic bag between uses, as it will continue to absorb contaminants in the air.