½ hour measurements.
CO is a toxic gas.
The highest concentrations of CO are found in streets with high traffic density. Here, petrol-driven cars are the main source. CO is continuously measured in streets in connection with the national air monitoring program.
Carbon monoxide (CO) is measured by absorption of infrared radiation. The air is drawn into a chamber and illuminated with infrared light. CO effectively absorbs light of a certain wavelength in the infrared range. The concentration of CO can therefore be determined by how much of the infrared light is absorbed in the chamber.
CO monitors (API M300):