Carbon Monoxide CO is produced by combustion processes and motor vehicles are a major source. Our local modeling and monitoring indicates the objective is currently being met. Back to top Lead Lead in the environment has come from leaded fuel or industrial processes. Since leaded fuel has now been phased out there are no industrial processes, the objective is being met. Nitrogen Dioxide Nitrogen dioxide is produced by combustion of fuels.
Motor vehicles are a major source.
Monitoring and modelling in Cambridge indicates that levels are above the standard set in the objective at the present time. Nevertheless, the Council will continue to monitor levels against this prediction. This pollutant can be produced by combustion processes, wind blown dusts and pollens as well as from chemical reactions in the atmosphere. Local monitoring as well as modeling indicates the national objective will be met by the target date. The objective for this pollutant is under review.