What causes variations in levels of Carbon monoxide?
High concentrations of CO generally occur in areas with heavy traffic congestion. Levels can vary based on wind speed and direction, air mixing zones, and other climatic factors. Peak CO concentrations typically occur during the colder months of the year when CO automotive emissions are greater and nighttime inversion conditions (where air pollutants are trapped near the ground beneath a layer of warm air) are more frequent. What is being done to reduce Carbon monoxide? EPA and the States have implemented many programs during the last two decades that have reduced CO emissions. At the national level, these measures include establishing national standards for tailpipe emissions, new vehicle technologies, and clean fuels programs. State emissions reduction measures include inspection and maintenance (I/M) programs and transportation management programs.
