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Airborne Toxicity

Chickens are highly sensitive to airborne irritants and toxic substances due to the unique structure of their respiratory system.

Their lungs are supported by a system of air sacs that facilitate a cross-current airflow pattern, allowing for highly efficient oxygen exchange. While this design enables chickens to extract more oxygen from each breath than mammals, it also increases their vulnerability to airborne toxins. As a result, chickens may absorb harmful substances more rapidly and reach toxic levels sooner than other species.

A wide range of airborne substances can pose a risk to poultry. Any product that produces strong odors, gases, or aerosolized particles should be considered potentially harmful. Common sources of airborne toxicity include:
  • Polytetrafluoroethylene (PTFE/Teflon): When heated above 536°F (280°C), PTFE releases toxic fumes that can be fatal to chickens if inhaled. It is found in nonstick cookware, self-cleaning ovens, irons, heat lamps, hair dryers, and other household products.
  • Tobacco smoke: Secondhand smoke exposure can cause acute respiratory distress, chronic respiratory disease, and may increase the risk of atherosclerosis.
  • Smoke from any source: Wildfires, house fires, or combustion gases (including carbon monoxide and fine particulates) can be rapidly fatal. Clinical signs may be delayed for several hours. Exposure can also suppress the immune system, increasing susceptibility to secondary infections.
  • Cleaning and disinfectant agents:Including bleach, ammonia, and other strong chemical cleaners.
  • Air fresheners and scented products:Including plug-ins, sprays, and products such as Febreze.
  • Vacuum cleaners with unfiltered exhaust: Can release fine particulates back into the air.
  • Candles and incense: Especially those that are heavily scented or produce significant smoke.
  • Volatile chemicals: Such as paints, solvents, gasoline fumes, glues, and industrial chemicals.
  • Aerosols and propellants: Including household sprays and grooming products.

Treatment

Treatment depends on the severity of exposure and clinical presentation and may include oxygen therapy, bronchodilators, diuretics (for pulmonary edema), antiinflammatories, fluid therapy, broad-spectrum antibiotics or analgesics. The use of corticosteroids remains controversial due to their potential immunosuppressive effects.

Clinical Signs

Increased respiratory effort
Open-mouth breathing
Exercise intolerance
Cyanosis
Sneezing and/or coughing
Ataxia
Weakness
Tail bobbing
Depression
Lethargy
Nasal discharge
Sudden death

Diagnosis

  • History
  • Clinical signs
  • Physical exam
  • Radiography - Useful to rule out other causes of respiratory disease and evaluation of heart and lungs for secondary complications. May not be apparent until advancement of the disease.
  • Hemogram
  • Endoscopy
  • Lung biopsy
  • Necropsy

Reported Cases

  • Case 1: Tea tree oil intoxication in a Cockatiel A one-year-old, male cockatiel was presented for clinical examination due to a serious despondency episode after the application of 3 drops of tea tree oil (Melaleuca alternifoglia) directly on the cutis of his right wing. The subject was urgently hospitalized and blood tests were performed. Serum biochemical values showed severe liver damage and slight renal involvement, complete blood count (CBC) parameters indicated a moderate neutrophilia a moderate neutropenia. Warm subcutaneous fluids and vitamin (VIT) B12 were administered, and after 8 h of fluid therapy the clinical condition of the patient improved. The subject was discharged after 48h of hospitalization, in stable conditions. Ref

  • Case 2: Smoke-induced respiratory infection in a Parrot A 4-year-old female blue-headed pionus parrot presented repeatedly for acute smoke inhalation. The protracted clinical course and secondary respiratory infections with multiple pathogens represented characteristic sequelae to smoke inhalation and toxicosis seen in other species. Ref

  • Case 3: Aerosol toxicoses in a Two American kestrels Aerosol toxicoses were diagnosed in two unrelated cases. In one case, two American kestrels died within 30 minutes of each other after showing respiratory signs minutes prior to death. Both birds were housed in a room where an oven was used immediately prior to the onset of their respiratory signs. The oven had been repaired weeks earlier for a gas leak. Both birds had red, wet lungs on gross examination and no other gross or microscopic findings. The second case involved seven of seven indoor parakeets that died in a 24-hour period. The lungs of the two birds submitted were dark red and wet and histologically there was marked pulmonary congestion, hemorrhage and edema. The owner regularly used teflonn-coated cooking pans. Polytetratuoroethylene (PTFE) gas, the cause of teflon toxicosis, is released when non-stick surfaces are heated above 360oC, a temperature that can be attained when teflon-coated pans boil dry or food burns. PTFE sources include non-stick cookware, drip pans, irons, ironing board covers, self-cleaning ovens, the heating elements of some reverse-cycle heat pumps and heat lamps. Ref

Treatment

NameSummary
Removal from the source
Supportive careIsolate the bird from the flock and place in a safe, comfortable, warm location (your own chicken "intensive care unit") with easy access to water and food. Limit stress. Call your veterinarian.
Intensive careOxygen therapy and fluids.
Bronchodilators
Analgesics
Antiinflammatories
DiureticsFor pulmonary edema
Broad-spectrum antibiotics

Support

Prevention

  • Avoid exposure to plug-in, wick, or spray air fresheners (including Febreze)
  • Avoid exposure to Scented candles and incense
  • Avoid exposure to cooking flavoring vapors (e.g., peppermint, spearmint, or other strong extracts)
  • Avoid exposure to paint, gasoline, glue, and solvent fumes
  • Avoid exposure to ammonia, bleach, and other strong disinfectants
  • Avoid exposure to aerosol sprays, propellants, and grooming products (e.g., hairspray, nail polish)
  • Avoid exposure self-cleaning ovens and other high-temperature PTFE-containing appliances

Prognosis

Varies depending on the length of exposure and chronicity of the resulting disease.

Scientific References

Risk Factors

  • Exposure to secondhand smoke from cigarettes or vaping products
  • Exposure to high levels of dust or dander accumulation
  • Exposure to smoke from fires (accidental or intentional)
  • Exposure to household chemical fumes (cleaners, disinfectants, solvents)
  • Exposure to scented consumer products (air fresheners, candles, aerosols, grooming products)
  • Exposure to industrial or fuel-related fumes (gasoline, paint, methane, adhesives, propellants)
  • Recent environmental exposure to fire or combustion events

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