6.7 Personal Protective Equipment (PPE) & Respiratory Protection

6.7 Personal Protective Equipment (PPE) & Respiratory Protection

Personal Protective Equipment (PPE) serves as the final barrier defending pesticide handlers from chemical exposure. Selecting, donning, wearing, and maintaining the correct PPE ensemble in accordance with pesticide label instructions is a strict legal requirement under FIFRA.

Chemical-Resistant PPE Selection

Not all protective materials provide equal defense against pesticide chemicals. Standard work clothing (cotton shirts, denim jeans, leather boots) readily absorbs liquid pesticides, holding toxic chemicals in direct contact with skin.

• Chemical-Resistant Materials: Barrier laminate (e.g., Silvershield, Sol-Vex), nitrile rubber, butyl rubber, neoprene, fluorocarbon (Viton), and polyvinyl chloride (PVC).
• STRICTLY PROHIBITED MATERIALS: Leather, cotton, canvas, and woven fabric gloves, boots, or hatbands must NEVER be worn when mixing, loading, or applying liquid pesticides. Leather absorbs liquids and cannot be decontaminated.

Comprehensive Body Protection Ensemble

1. Gloves: Must be unlined (lined gloves trap pesticide liquids against skin) and chemical-resistant. Placement Rule:
   • When spraying downward (ground application): Wear sleeves outside the gloves so liquid spills slide down over the glove exterior.
   • When spraying overhead (tree canopy / structural ceiling): Wear gloves outside the sleeves and cuff the glove rims upward to prevent liquid from running down arms inside sleeves.
2. Footwear: Unlined chemical-resistant rubber or neoprene boots. Pant legs must be worn outside the boot tops to prevent spilled liquid from funneling inside.
3. Bodywear: Heavy-duty chemical-resistant apron when mixing and loading concentrates (the highest-risk operational step). Liquid-proof chemical suits or Tyvek coveralls for high-exposure spraying.
4. Eye Protection: Protective eyewear must be selected based on spray hazard:
   • Indirect-Vented Chemical Splash Goggles: Fully sealed around eyes with baffled ventilation ports; required for mixing and loading liquid concentrates.
   • Full-Face Shield: Worn over goggles when handling highly toxic Category I liquid concentrates.
   • Note: Standard safety glasses with side shields are inadequate for mixing liquid chemicals.

Respiratory Protection Devices

Respirators protect applicators from inhaling toxic dusts, mists, vapors, or gases.

+-------------------------------------------------------------------------+
|                        RESPIRATOR CATEGORIES                            |
+-------------------------------------------------------------------------+
| 1. Air-Purifying Respirators (APR):                                    |
|    - Half-mask or full-facepiece; uses filters/cartridges.              |
| 2. Powered Air-Purifying Respirators (PAPR):                           |
|    - Blower forces filtered air into hood/facepiece.                    |
| 3. Atmosphere-Supplying Respirators (SAR & SCBA):                      |
|    - Delivers fresh air from compressed tanks (required for fumigants). |
+-------------------------------------------------------------------------+

NIOSH Filter Ratings & Cartridge Types

The National Institute for Occupational Safety and Health (NIOSH) tests and certifies respirator filters according to oil resistance and particulate efficiency:

• Oil Resistance Letter Designations:
  • N Series (Not resistant to oil): Use only for dry dusts or water-based sprays containing zero oil solvents.
  • R Series (Resistant to oil): Suitable for oil-based sprays; limited to a single shift (8 hours) of use.
  • P Series (Oil-Proof): Completely oil-proof; reusable for multiple shifts per manufacturer guidelines.
• Particulate Filter Efficiency Ratings: 95%, 99%, or 100% (HEPA / P100). A P100 filter captures 99.97% of airborne particles down to 0.3 microns.
• Chemical Cartridges: Organic Vapor (OV) cartridges contain activated charcoal to absorb pesticide organic vapors. For liquid mixing, applicators typically use a combined OV/P100 cartridge (organic vapor chemical cartridge with an attached P100 particulate prefilter).

OSHA & Worker Protection Standard (WPS) Compliance

Under OSHA (29 CFR 1910.134) and the EPA Worker Protection Standard (WPS), any employer requiring workers to wear tight-fitting respirators must implement a complete written respiratory protection program including:

1. Medical Evaluation: Before fit testing or initial respirator use, workers must receive a confidential medical evaluation by a Physician or Licensed Healthcare Professional (PLHCP) to ensure their lungs and heart can handle the physical strain of respirator breathing.
2. Fit Testing: Mandatory prior to initial use and annually thereafter (or whenever weight changes by >20 lbs):
   • Qualitative Fit Test (QLFT): Pass/fail test using bitter (Bitrex), sweet (Saccharin), or banana oil vapors to detect facepiece leakage.
   • Quantitative Fit Test (QNFT): Uses a numerical particle-counting instrument (PortaCount) to measure exact leakage ratios.
3. User Seal Checks: Must be performed by the applicator EVERY TIME the respirator is donned:
   • Positive-Pressure Check: Block exhalation valve with palm and exhale gently; facepiece should puff slightly outward without leaks.
   • Negative-Pressure Check: Block inlet cartridges with palms and inhale gently; facepiece should collapse slightly inward against face.
4. Cartridge Replacement Schedules: Cartridges must be replaced immediately if breathing resistance increases, if chemical taste/odor is detected, if damaged, or per WPS guidelines (maximum 8 hours of cumulative use for organic vapor cartridges during pesticide applications).