Dioxins are persistent organic pollutants produced during certain industrial and combustion processes. They can remain in the environment for many years and may enter the food chain through air, soil and water.
Extended periods of drought and increased wildfire activity in some regions have highlighted the importance of understanding how environmental contaminants can affect agricultural production and food safety. While the immediate impacts on communities and ecosystems remain the primary concern, food businesses should also be aware of potential contamination risks that may arise following environmental pollution events.
One area receiving increased attention is dioxin contamination on fresh produce.
What are dioxins?
Dioxins are a group of persistent organic pollutants (POPs) generated as by-products of certain industrial and combustion processes. Because they break down slowly, they can remain in the environment for many years and may enter the food chain through air, soil and water.
While dioxins are most commonly associated with animal-derived foods due to their tendency to accumulate in fatty tissues, fresh produce can also be exposed through environmental contamination.
How can fresh produce become contaminated?
Unlike meat and dairy products, fruits and vegetables do not typically accumulate significant levels of dioxins internally. Instead, contamination usually occurs when residues settle onto the surface of crops.
Air pollution and combustion emissions
Smoke, ash and airborne particles generated by industrial processes, waste incineration and wildfires can contain dioxins. These particles may travel considerable distances before settling on agricultural land and exposed crops, particularly leafy vegetables.
Contaminated soil
Dioxins can persist in soil for many years. Crops grown in areas affected by historical industrial activity or legacy pollution may be exposed through contact with contaminated soil. Low-growing produce can be particularly vulnerable to contamination from soil particles.
Agricultural inputs
The use of contaminated sewage sludge or industrial composts can introduce dioxins into agricultural land. Careful assessment of agricultural inputs plays an important role in managing this risk.
Industrial runoff and irrigation water
Irrigation water sourced from rivers, reservoirs or watersheds affected by industrial pollution may introduce contaminants onto edible plant surfaces, making monitoring and risk assessment important for food producers.
Why testing matters
Food supply chains are increasingly exposed to changing environmental conditions and complex sourcing networks. Understanding potential contamination risks is an important part of maintaining food safety, regulatory compliance and consumer confidence.
Testing can help businesses:
- Assess contamination risks following environmental incidents
- Support supplier verification and due diligence programs
- Demonstrate compliance with food safety requirements
- Protect brand reputation and consumer trust
- Make informed sourcing and production decisions
Testing may be particularly valuable for growers, producers, processors, importers, exporters and retailers sourcing produce from regions that have experienced environmental contamination events.
Key takeaways
- Dioxins are persistent environmental pollutants that can remain in the environment for long periods
- Fresh produce is generally contaminated through environmental exposure rather than internal accumulation
- Potential sources include wildfire smoke, industrial emissions, contaminated soil, agricultural inputs and polluted irrigation water
- Environmental monitoring and analytical testing can help businesses assess and manage potential risks
- Proactive testing supports food safety, regulatory compliance and supply chain confidence
How SGS can help
Understanding potential contamination risks is an important part of food safety and supply chain management. SGS provides analytical testing and technical expertise to help businesses evaluate dioxin risks, support compliance requirements and make informed decisions.
For more information, please contact:
Dr. Naresh Patel
Food Technical Accounts Director
United Kingdom
t: +44 (0) 151 350 6666
FAQs
Wildfires can generate smoke and ash that may contain environmental contaminants, including dioxins. These particles can travel through the atmosphere before settling on agricultural land and crop surfaces.
Dioxins can be deposited from the air, transferred through contaminated soil, introduced through agricultural inputs or deposited via polluted irrigation water.
Fresh produce generally carries contamination on its outer surfaces rather than accumulating significant amounts internally, as is more commonly seen in animal-derived foods.
Testing helps food businesses assess contamination risks, demonstrate due diligence, support regulatory compliance and maintain consumer confidence.
Growers, producers, processors, importers, exporters, retailers and food manufacturers may benefit from risk assessments and testing programs, particularly when sourcing produce from regions affected by environmental contamination events
