Formaldehyde has been classified by the World Health Organization as a carcinogen and teratogen. It is a recognized allergen and one of the most potent potential mutagens. Being colorless and odorless, formaldehyde poisoning often goes unnoticed. Therefore, it is crucial to understand its symptoms and prevention methods.
Different concentrations of formaldehyde cause varying degrees of poisoning:
At concentrations of 0.06-0.07 mg/m³ in indoor air, children may experience mild wheezing. When levels reach 0.1 mg/m³, an unpleasant odor and discomfort become noticeable. At 0.5 mg/m³, eyes may become irritated and teary. Concentrations of 0.6 mg/m³ can cause throat discomfort or pain.At higher concentrations, it can cause nausea, vomiting, coughing, chest tightness, wheezing, or even pulmonary edema. At 30 mg/m³, it can cause immediate death.
Specific manifestations of formaldehyde poisoning symptoms:
Mild poisoning—Noticeable irritation of the eyes and upper respiratory tract mucosa.Main manifestations include conjunctival hyperemia, redness, and swelling; difficulty breathing; coarse breathing sounds; hoarseness; and dry, husky, or wet, sticky voice. X-rays reveal increased and thickened pulmonary纹理, typical symptoms of acute bronchitis in medical terms. Another specific manifestation of mild formaldehyde poisoning is grade one or two laryngeal edema.
Second Manifestation of Formaldehyde Poisoning Symptoms:
Moderate Poisoning — Persistent coughing, expectoration, chest tightness, dyspnea, and dry or wet rales.Chest X-rays reveal solidified pulmonary纹理 transforming into scattered punctate spots or patchy shadows, indicating bronchopneumonia. Laryngeal edema progresses to grade 3. Blood gas analysis shows mild to moderate hypoxemia.
Specific Manifestation Three of Formaldehyde Poisoning Symptoms:
Severe poisoning — Worsening pulmonary and laryngeal conditions, presenting with pulmonary edema and grade IV laryngeal edema. Arterial blood gas analysis shows severe, profound hypoxemia.
How to Remove Formaldehyde After Renovation
It is advisable not to move into a newly renovated home immediately, regardless of how eco-friendly the materials used. Harmful gases emitted from newly decorated spaces include formaldehyde, benzene, ammonia, radon, TVOC, and other toxic substances.How to remove formaldehyde after renovation? Common methods include: using green plants to absorb harmful gases; ventilation—keeping windows and doors open for half a month to naturally circulate and dilute indoor pollutants; and activated carbon adsorption—using activated carbon or bamboo charcoal to remove these gases, currently the most widely adopted approach.
For low to moderate pollution, plant-based purification is suitable: In environments with mild to moderate indoor pollution—where contamination levels are below three times the national standard—plant purification can achieve relatively good results. Utilize plants with adsorption properties such as spider plants, snake plants, ivy, aloe vera, agave, and gerberas to absorb formaldehyde in the room and achieve removal effects.
Numerous formaldehyde removal products are available on the market, such as formaldehyde removers. This method is the most direct and effective for eliminating formaldehyde, but it demands highly specialized products. Current options include chemical agents, nano photocatalysts, and plant-based formaldehyde removal extracts. These products may cause some "secondary pollution," so caution is advised during use.