Black carbon (soot)

Black carbon promotes the antibiotic resistance of bacteria and the spread of infections in the respiratory system.

People who burn or heat with wood in private households are exposed to a concentration of sooth 2.5 times higher than others who do not use wood. However, soot from wood burning has also been detected in homes that do not burn wood at all. 

When wood is burned outdoors, on average 78% of the black carbon particles end up in nearby houses. This shows that houses provide only  minimal protection against pollutants from wood burning.