Using a simple google search:
Here are the facts about the "effects of exposure to carbon (black).
"What are the main health hazards associated with breathing in carbon black?
Carbon black does not appear to cause significant harmful effects after a single short-term exposure, except general effects that would be expected with any fine dust (high concentrations can cause coughing and mild, temporary irritation).
Carbon black can have potentially serious respiratory effects following long- term inhalation. Refer to "Effects of Long-Term (Chronic) Exposure" below for information.
INHALATION: Carbon black dust is extremely fine and light and can be breathed deeply into the lungs, where it can accumulate. Normally the dust is cleared gradually from the lungs and has no harmful effects. However, high concentrations of dust can overwhelm the clearance capacity of the lungs, obstruct the lungs, and interfere with lung function. Symptoms may include coughing, increased phlegm production, and shortness of breath. A number of studies have shown x-ray changes, reduced lung function, emphysema and/or chronic bronchitis in some carbon black workers. In other studies, no respiratory effects were seen. A few studies have shown evidence of fibrosis (scarring of the lungs) in the area surrounding carbon black deposits in the lungs.
Non-specific irritant effects including cough and changes in lung function, have been observed in workers occupationally exposed to carbon black. In one case, these effects were seen in workers exposed to airborne concentrations of up to 0.45 mg/m3 respirable dust and up to 1.60 mg/m3 total dust. Interpretation of the studies is complicated by the lack of exposure information (airborne concentration of carbon black, duration of exposure and/or particle size), small study population size, lack of information regarding smoking history and lack of information about other potential occupational exposures. At this time, it is not possible to establish a dose-response relationship between exposure levels and specific effects. However, limited animal and human evidence suggests that significant and potentially irreversible lung effects may occur with exposures to high airborne concentrations (10-100 mg/m3)."
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