1. Exposure Variance to Inhalable Agricultural Dust among Dairy Farm Workers
Madeleine Hornick
2/27/13

2. Background
Estimated 1 million agricultural workers in U.S. are at risk for lung disease
Suggested exposure levels to ag. dust
Recommended 2.4 mg/m3 for total dust in swine and poultry confinements
Limited exposure assessment research among dairy farm workers

3. Project Methods 9 dairy farms throughout Midwest
(IA, SD, MN, WI)
Personal inhalable dust exposure measurements from 80 dairy farm workers
1 work shift
63 people were sampled 1 day each; 17 people were sampled 2 days each

4. Project Methods
2 inhalable samplers were attached to each individual for the entire work day
Sampler orientation was designated as R or L after the first 12 individuals were sampled

5. Exposure Sampling

6. Exposure Sampling
Button Inhalable Sampler
Personal Air Sampling Pump

7. Data
Collected:
Sampler orientation
Concentration of inhalable dust
Date of sampling
Temperature
Relative Humidity
Length of sampling period
Ln transformed data (personal exposure and environmental sample measurements are typically log normal)

9. Statistical Analysis Between Sampler Repeat Samples (different days)
A vs. B (1-80)
R vs. L (13-80)
R vs. L (13-80, only R-handed)
Repeat Samples (different days)
Temp and RH% vs. Concentration
Within Worker
Between Worker