Having worked in metal fabrication for several years, I've witnessed firsthand the hazards of welding fumes, often referred to as khói hàn. These fumes are generated when metal is heated and molten, releasing tiny particles and gases that can be highly toxic. Long-term exposure without adequate protection can lead to yellowing of the eyes and skin, respiratory issues, and even chronic conditions. From my experience, many workers underestimate the dangers because symptoms like sore throat, persistent cough, and eye irritation may seem mild initially. However, these are warning signs that harmful substances, including lead and other heavy metal particles, are entering the respiratory system and body. I've seen colleagues develop serious health problems after years of ignoring these signals. Using proper ventilation systems, such as industrial exhaust fans or quạt hút khói chuyên nghiệp (professional fume extractors), significantly reduces the concentration of welding smoke in the air. It's also crucial to wear appropriate protective gear, like respirators designed for welding, even if working in seemingly open or well-ventilated spaces. Remember, khói hàn is not just an annoyance but a serious occupational hazard. Taking preventive measures protects your health and ensures longevity in your career. If you experience symptoms like chronic coughing, eye redness, or discomfort around your throat, seek medical advice promptly and review your workplace safety practices. Your health is worth more than convenience.