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Figure 16 illustrates the annual nitrogen dioxide concentration. The results are similar in scale to those of particulates with maximum values occurring in the core city area with extrusions into Adams County. The hot spot situated to the east of the principal maximum is a consequence of Stapleton Airport nitrogen dioxide emissions.

Summary

Both the 1-hour standard of 35 parts per million (ppm) and the 8-hour standard of 9 ppm for carbon monoxide will be violated in the Denver metropolitan area in 1980 and 1985. Actual carbon monoxide levels are expected to remain about the same until 1980, then decrease by nearly half from 1980 to 1985, largely because of the proposed Federal motor vehicle emissions control program which will require 1977 and later model year automobiles to meet Federal emissions standards at the point of sale.

Levels of ozone will continue to violate the standard of .08 ppm in 1980 and 1985, but measured levels of the pollutant are projected to decline, primarily after 1980.

Particulate levels in 1980 and 1985 will violate both the annual standard for particulates of 45 micrograms per cubic meter and the 24-hour standard of 150 micrograms per cubic meter. The particulate standard is violated now, but actual amounts of particulate matter in the air will be greater in future years.

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