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Air Quality

Practices to Reduce Odor from Livestock Operations
Odors generated in livestock housing can exit the facility and make their way to downwind neighbors. Even systems that utilize external manure storage will have some manure within the housing itself, creating odor. Additionally, there will be odors and dust particles from feed and animals themselves. Odorous compounds tend to be carried on dust particles and therefore, strategies to reduce odors from animal housing focus primarily on housekeeping measures that reduce dust emissions. Read entire article.

View ‘Reduce Odor from Livestock Operations Flowchart’ here

Practices to Reduce Ammonia Emissions from Livestock Operations
In livestock facilities, ammonia results primarily from the breakdown of urea (present in urine) by the enzyme urease (excreted in feces). In poultry, urease is excreted with uric acid. Undigested feed protein and wasted feed are additional sources of ammonia in animal production systems. Strategies to reduce ammonia from animal housing focus primarily on preventing ammonia formation and volatilization, or downwind transmission of ammonia after it is volatilized. Read entire article.

View ‘Reduce Ammonia from Livestock Operations Flowchart’ here

Practices to Reduce Hydrogen Sulfide from Livestock Operations
Gases generated in livestock housing facilities can exit the facility and make their way to downwind neighbors. Even systems that utilize external manurestorage will have some manure within the housing itself, which may lead to gaseous emissions. Strategies to decrease hydrogen sulfide emissions from animal housing focus primarily on reducing the formation and movement of sulfur compounds. Read entire article.

View ‘Reduce Hydrogen Sulfide from Livestock Operations Flowchart’ here

Practices to Reduce Dust and Particulates from Livestock Operations
Dust and particulate matter (PM) generated in livestock housing can exit the facility and make its way to downwind neighbors. Within the housing area, dust particles from the feed and the animals themselves will be present. Reducing dust and PM from animal housing will contribute to improved odor conditions because some portion of odor is carried on dust particles. Read entire article.

View ‘Reduce Dust and Particulates from Livestock Operations Flowchart’ here

The Science of Smell-Part 1: Odor Perception and Physiological Response
Olfaction, the sense of smell, is the least understood of the five senses. This, among other factors, makes the task of reducing livestock odors a considerable challenge. Read entire article.

The Science of Smell-Part 2: Odor Chemistry
Odor chemistry is complex and still poorly understood. More than 75 odorous compounds, in varying proportions, have been identified in livestock manures. Knowing the chemical basis of odors derived from animal manure is helpful to understand how odor develops and what can be done to design and manage manure systems and avoid nuisance com plaints. Read entire article.

The Science of Smell-Part 3: Odor Detection and Measurement
As perceived by humans, odors have five basic properties that can be quantified: 1) intensity, 2) degree of offensiveness, 3) character, 4) frequency, and 5) duration, all of which contribute to the neighbor’s attitude towards the odor as well as the business generating the odor. Read entire article.

The Science of Smell-Part 4: Principles of Odor Control
Methods to control and reduce odor are of great interest to livestock producers. Choosing which odor control practices to employ can be a diffi cult decision. However, understanding the principles behind effective odor control strategies can help make the decision easier. Read entire article.

Odor Control Methods Used by Iowa Pork Producers
Air and odor issues related to livestock production have received much attention recently and are a primary concern for pork producers. To establish baseline informationabout the odor control technologies used by producers, a survey was conducted in 2002. In early August, 3,249 surveys were sent to pork producers and 562 were returned and usable. This report provides a summary of the types of odor control methods used by Iowa pork producers and the level of satisfaction with those methods. Read entire report.

Feed Management to Raise Swine and Protect the Environment
By Dale Rozeboom and Gretchen Hill

Carbon Market Opportunities for Agriculture
By David Beede and Wendy Powers

Odor Control - Pamphlet (download here)

EPCRA information

Animal Air Quality Research Facility (AAQRF)

Current and on-going research at the AAQRF

The Air We Breathe
By Wendy Powers
Does animal agriculture affect air quality? Here’s what the former CEO of the Institute of Toxicology and Safety says. Read entire article

The Nose Knows
By Jordan Barnes
MSU Extension has gotten a whiff of a technology that will help educators, farmers and rural residents understand odors better. Extension has trained 10 Animal Ag and Environment AoE (AAE) team members in the use of the Nasal Ranger® for detecting odor levels, both good and bad. Read entire article.

Taking Steps To Improve Air Emissions
By Wendy Powers
Determining how to reduce emissions is a complicated task. Universities across the United States are collaborating to develop a tool that will help producers make those determinations and become even better neighbors. Read entire article

Changing Animal Diets Can Help Control Air Emissions
By Wendy Powers

Odor is among t he top complaints from neighbors of livestock and dairy farms. Modifying animals’ diets can cut down odor and complaints. Read entire article

Air Quality and Agriculture
Odor is the major issue locally and regionally (1). For example, over 330 different odor-causing compounds have been measured in swine manure. However, the particular compounds that are perceived as offensive are not well understood. Read entire article

Biofilters
Odor control is often a concern for swine operations, and one of the methods proven to reduce odor is the use of a biofilter. A biofilter is a bed of organic material through which odorous air is passed.  Read entire article

Odor Reduction by Ozonating Swine Waste
At the east end of the MSU Swine Research and Teaching Facility, there is a small out-building that houses equipment that can improve the offensive odor associated with applying accumulated swine waste to the nearby cropland. Read entire article

Manure - What Makes it Stink?
The problem of odors from manure on farms has been around for a long time. But in recent years there have been an increasing number of complaints about odors emanating from animal producing farms.Read entire article

Ventilation and Animal Health
Barn ventilation is often associated with animal respiratory health. But ventilation—directly and indirectly—impacts many other aspects of animal health as well. Good ventilation in the freestall area of the lactating cow barn helps to keep bedding dry, a factor in favor of good udder health. Read entire article

Developing Computer Modeling Tools To Improve Water Quality in Agricultural Watersheds
Michigan has an abundant and diverse supply of freshwater due to its unique geographical location within the Great Lakes Region. These waters provide a wealth of resources for the diverse agricultural, industrial, and recreational activities of the state. Read entire article

Impacts of Air Emissions on Michigan Communities
Potential health impacts of livestock and poultry farms on nearby residents is an issue that livestock and poultry industries have faced nationally, though the topic is dealt with primarily at the local level. Read entire article