røyken

Røyken is the definite form of the Norwegian noun røyken, which means smoke. In everyday use, røyken refers to the visible plume produced by combustion, such as from a campfire, a chimney, or a vehicle exhaust. Smoke is a heterogeneous mixture of gases and fine particles that can vary in color and density depending on the fuel and conditions of combustion. Its dispersion in the atmosphere is influenced by wind, temperature, humidity, and terrain. Exposure to smoke can irritate the eyes, nose, throat, and lungs, and long-term exposure has been linked to cardiovascular and respiratory health problems. Regulation and public health measures typically focus on reducing emissions and monitoring air quality to protect inhabitants and the environment.

Røyken is also used as a place name in Norway. It was the name of a municipality in the former Buskerud county; after recent administrative reforms, the area is now part of a larger municipality within the county of Viken. The name persists in local geography and in historical references to the Oslofjord region west of the capital.