The name Minneapolis is attributed to Charles Hoag, the city's first schoolteacher, who combined mni, a Dakota Sioux word for water, and polis, the Greek word for city.
EGR valve on top of the inlet manifold of a Saab H engine in a 1987 Saab 90. In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NOx) emissions reduction technique used in petrol/gasoline and diesel engines. EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders.
Diesel exhaust is produced when an engine burns diesel fuel. It is a complex mixture of thousands of. gases and fine particles (commonly known as soot) that contains more than 40 toxic air. contaminants. These include many known or suspected cancer-causing substances, such as benzene, arsenic and formaldehyde.