So, to answer your question, yes, black soot can be dangerous and even fatal to some people. … When in the body, soot particles can cause coronary heart disease, breathing issues, including asthma, and even cancer. Those most affected by soot include infants, the elderly, and those with prevailing breathing conditions.

What causes thick black dust in house?

Black dust coming out of AC vents is usually caused by: Candle or fireplace soot. Leaky ducts. Mold growth.

What causes soot in the air?

Soot is a byproduct of burning fossil fuels, particularly coal. It is emitted by a variety of sources, including burning coal for electricity or industrial fuel, manufacturing, oil refining, and motor vehicles. Soot is released into the air as either extremely small particles or liquid droplets.