Do Pig Farms Stink?

Do Pig Farms Stink?

There is a question that I have been asked quite a lot, it’s do pig farms stink?”. We all know that every farm has its kind of smelly. There are always smells associated with agriculture, no exception. This question, however, emphasizes on stinking.

So if they do, what is the cause? How to prevent or at least control it? We will get you through all that with as much information as possible.

do pig farm stink

Do pig farms stink?

Sadly the answer is yes. If the hog farms operate without or even have barely enough effective practices to contain pig manure, it would get so smelly, hence creates a very strong odor. 

The stench these hog farms emitted is certainly nauseous, not to mention it include dust, irritants, allergens, as well as hydrogen sulfide, ammonia, nitrogen and phosphorus which interacts with hundreds of gaseous organic compounds from the slaughterhouses. Those toxic emissions cause a measurable impact on human well-being.

How does pig farm odor affect human health?

pig farm odor

The dust from the dried waste traps the odors and spreads easily through the farms’ ventilators. The foul-smelling dust sticks to all that lies in its course, including people’s lungs.

According to researchers, the manure waste which is collected in open cavities or sprayed as fertilizer carries microbes can make us sick. The hog farms odor could cause blood pressure rising, stress, and negative mood states in the nearby residents.

The link between odors and those symptoms has been proven by Steve Wing – an epidemiologist from the University of North Carolina. He found that stronger odors and higher reported concentrations of hydrogen sulfide were all associated with higher blood pressure in residents.

The smell of odors breeds conflicts between the surrounding residents and hog farms eventually. In fact, there were many lawsuits that filed against pig farms around North Carolina in 2018 alleged that those farms are a nuisance. One of the main concerns was that the odor of hog farm.

Many people also claimed that the smell was so bad that it’s nearly impossible for them to get outside normally. They cannot manage their garden, hang their laundry (which would turn out full of smell) or invite relatives and friends over for a party in the yard, not to mentions the fly infestation.

Now you get the answer to “do pig farms stink?”, it’s to do with waste and odor. Want to know how to control it? Keep scrolling if you do.

How to control the odor?

All farms have odor, naturally. Pig farms on its own even have an awful stench. If you need help managing the odor of your hog farm, check out the 10 steps below.

1. Deciding the location

When choosing a location, consider the distance to neighboring homes and public facilities based on the number and weight of pigs, the dominant wind pattern, topography and land usage.

Understanding the dominant wind pattern would help to avoid sitting your farm at the upwind positions. Choosing the right site is no doubt the cheapest odor-controlling method at hand.

2. Handling the pigs’ manure

Injecting manure will reduce the odor by 50-75% compared to broadcasting. It cost around $0.003/gal. Umbilical structures can be less noticeable than tankers due to the difference in road flow.

3. Dietary formulation

Cutting raw protein levels and increasing crystalline amino acids will lower the odor by 20%. Use low sulfates and nitrates drinking water. Use proper grinding or pelleting to improve digestibility, from that decrease nitrogen discharge by 20-24%. You can also add a little oil to the pig feeder to reduce dust (you can see more best pig feeder on the money here)

4. Storing pigs manure

Proper covering always good at preventing gases from escaping. Impermeable covers are preferable than permeable as their odor reduction notably higher (70-85% in compared to 40-50%), in return, they cost higher (1-1.4 dollar/sq. ft. in compared to 10-25 cent).

5. Avoiding eye appeal

“Out-of-sight, out-of-mind”, people tend to criticise less when the hog administration is out of sight.

6. Pit ventilation

The more odorous air emerges from the pit, adding more than half of the overall smell at crucial times. Pit ventilation accelerates volatilization and has a few advantages for indoor air quality.

7. Using biofilters

Exhaust air biofiltration is an aerobic oxidation method that breaks up volatile compounds into carbon dioxide, water, and mineral salts. This means drawing odorous air through a biofilter bed can reduce smell as well as toxic wastes like ammonia, hydrogen sulfates, and dust.

The biofilters have to be arranged properly in order to well function. At best, odor level can be reduced by 65-80%. You have to make sure the biofilters are compatible with the ventilation system if you plan to apply this method.

8. Using vegetative filters

This environmental buffer could take years to build. It is formed by shorter bushes or trees in the outside row and gradually taller trees in the row closer to the construction. It can help to lift and mix the odor emitted.

9. Using chimneys

Installing vertical stacks or chimneys that exhaust above the ridgeline in some situations helps spread the odor better. It also reduces the noise of the ventilation system.

10. Using other deterrents

– Additives: Most efficient in dilute systems; the effectiveness ranges from 0 to around 20%.

– Aeration: Costs about 4$/pig with the effectiveness of 40-80% in dilute systems

– Barriers: Forcing air up and lessen dust at ground level.

– Biocurtains: Eliminate dust.

– Digestion: 50-80% effective in odor-reducing but needs a big investment

– Oil sprinkling: 40-50% effective but might cause slippery conditions.


So, pig farms do stink. Odors, which are produced primarily from manure but also from rotting feed and carcasses, are a major concern of the swine industry. Large pig farms and risen public concern about hog farms odors have resulted in a series of lawsuits in recent years.

If you are planning on establishing a pig farm, we hope this article brings you some insights that could help in the adapting and managing process.


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