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Last updated: April 8, 2026

Quick Answer: Burning PT (pressure-treated) wood can release hazardous chemicals into the air, including arsenic, chromium, and copper. These chemicals are toxic and can pose significant health risks, particularly to those with respiratory issues or prolonged exposure. Therefore, burning PT wood is generally not recommended due to these safety concerns.

Key Facts

Pressure-treated wood contains chemicals like arsenic, chromium, and copper for preservation.
Burning PT wood releases toxic fumes and heavy metals into the atmosphere.
Inhaling these fumes can lead to respiratory problems, skin irritation, and other health issues.
Proper disposal of PT wood, such as landfilling or incineration at specialized facilities, is recommended.
Never burn PT wood in open fires, fireplaces, or wood stoves intended for residential use.

Overview

Pressure-treated (PT) wood is a popular material used in construction for its enhanced durability and resistance to rot, decay, and insect infestation. This treatment involves infusing wood with chemical preservatives under pressure, which significantly extends its lifespan compared to untreated lumber. Common applications include decks, fences, outdoor furniture, and playground equipment. While its longevity is a key benefit for its intended uses, the presence of these chemicals raises important questions about its safety when subjected to combustion.

The primary concern surrounding the burning of PT wood stems from the chemical preservatives used in its treatment process. These chemicals, designed to protect the wood from biological degradation, can be released as toxic byproducts when the wood is burned. Understanding the composition of these preservatives and the potential emissions is crucial for making informed decisions about disposal and avoiding potential health and environmental hazards associated with burning this material.

How It Works

Chemical Composition of PT Wood: The most common type of pressure-treated wood in North America uses alkaline copper quaternary (ACQ) or copper azole (CA) preservatives. Historically, chromated copper arsenate (CCA) was widely used, but its use has been significantly restricted for residential applications due to concerns about arsenic. These treatments involve forcing copper-based compounds and organic biocides deep into the wood fibers. The copper acts as a fungicide and insecticide, while the other components offer additional protection.
Combustion Byproducts: When PT wood is burned, the heat causes a chemical breakdown of these preservatives. This process releases a cocktail of potentially harmful substances into the air. The copper compounds can vaporize and form fine particles that are easily inhaled. Arsenic, if present (particularly in older CCA-treated wood), is released as toxic arsenic oxides. Other components of the wood itself, along with incomplete combustion products like carbon monoxide and dioxins, further contribute to the hazardous emissions.
Health Risks of Inhalation: Inhaling the fumes from burning PT wood can have serious health consequences. Copper particles can irritate the respiratory tract, leading to coughing, shortness of breath, and exacerbation of conditions like asthma. Arsenic is a known carcinogen and can cause a range of symptoms including nausea, vomiting, diarrhea, and long-term risks of various cancers. The fine particulate matter can also lodge deep in the lungs, leading to inflammation and other respiratory ailments. Skin contact with the ash or smoke can also cause irritation.
Environmental Contamination: Beyond immediate health risks, burning PT wood can contaminate the surrounding environment. The toxic chemicals released can settle on soil and water sources, potentially impacting ecosystems and entering the food chain. This makes improper disposal through burning a threat not only to human health but also to the broader environmental balance.

Key Comparisons

Disposal Method	Open Burning	Controlled Incineration (Specialized Facility)	Landfilling
Air Emissions	High release of toxic chemicals (arsenic, copper, dioxins)	Controlled, with emissions scrubbed and treated	Minimal direct air emissions from the wood itself
Health Risks	Significant direct risk to public health from fumes	Minimized risk due to safety protocols and containment	Low direct risk to public health from the wood’s chemical content
Environmental Impact	High risk of soil and water contamination, air pollution	Managed emissions, potential for energy recovery	Requires land space, potential for leachate management
Legality & Regulation	Often illegal or heavily restricted in residential areas	Regulated and compliant with environmental standards	Generally permitted with specific requirements for treated wood
Cost	Low immediate cost (if allowed)	Can involve tipping fees	Can involve tipping fees

Why It Matters

Health Impact: Studies have shown that prolonged exposure to the airborne toxins released from burning PT wood can increase the risk of respiratory illnesses and certain types of cancer. The immediate effects can range from acute irritation to more severe symptoms depending on the duration and intensity of exposure.
Regulatory Restrictions: Due to the significant health and environmental risks, the open burning of PT wood is prohibited or strictly regulated in many municipalities and regions. These regulations are in place to protect public health and prevent widespread environmental contamination.
Proper Disposal Alternatives: The recommended methods for disposing of PT wood involve taking it to a licensed landfill that accepts treated lumber or utilizing specialized industrial incineration facilities designed to handle hazardous waste. These methods ensure that the chemicals are managed in a contained and controlled environment, minimizing public exposure and environmental harm.

In conclusion, while pressure-treated wood offers valuable benefits in construction, its disposal requires careful consideration. Burning PT wood is a dangerous practice that releases toxic chemicals into the atmosphere, posing significant risks to human health and the environment. It is imperative to adhere to proper disposal guidelines and avoid burning this material in any residential setting. Choosing safe and regulated disposal methods is essential for protecting ourselves and the planet.