The hazards include: difficulty breathing, skin inflammation, and allergic reactions.

1. Difficulty breathing. The tight construction of activated carbon filters may increase airway resistance, preventing oxygen from effectively entering the lungs, which may cause symptoms such as difficulty breathing, sore throat, headaches, and dizziness.

2. Skin inflammation. The tight fit of a mask can increase friction, especially in humid environments, making the skin more susceptible to infection.

3. Allergic reaction. Activated charcoal is considered a natural material, but wearing an activated charcoal mask can still cause allergic reactions, especially in users who are already allergic or prone to allergies.