Question

diesel engine exhaust is hazardous because it _____.
is flammable
cannot be filtered by a respirator
contains carbon monoxide and soot
contains carbon dioxide

Explanation:

Diesel engine exhaust contains harmful substances like carbon - monoxide (a toxic gas) and soot (particulate matter). Carbon - monoxide binds to hemoglobin in the blood, preventing normal oxygen transport, and soot can cause respiratory problems. Flammability is not the main reason for its hazard. Some respirators can filter certain components of diesel exhaust, and carbon - dioxide is a common gas not the main cause of its hazard.

Answer:

C. contains carbon monoxide and soot