In 2002, the Iowa Legislature directed the DNR to perform a field study to determine airborne levels of ammonia, hydrogen sulfide, and odor near animal feeding operations. The links below contain the final results of the study and supplemental information.

Odor Study Results and Resources

• Results of the Iowa DNR Animal Feeding Operations Odor Study

Additional Information

• AFO Odor Study Procedures, 2005
• A Review of The Science and Technology of Odor Measurement

Hydrogen Sulfide and Ammonia Results and Resources

Executive Summary

• Executive Summary

Full Report

• Introduction
• Summary Tables
• Map of Monitoring Sites
• Site Results-Introduction

Site Results

• Atlantic
• Belmond (Old)
• Belmond (New)
• Clarion
• Goldfield
• Iowa Falls
• Jewell
• Kanawha
• Malcom
• Newkirk
• Sac City
• Sioux Center
• Stanhope
• Viking Lake
• West Union
• Williams
• Woodbine

Appendices

• Appendix A
• Appendix B
• Appendix C
• Appendix D
• Appendix E
• Appendix F
• Appendix G

Additional Information

• Hydrogen Sulfide and Ammonia Study Procedures, 2005