Files

Abstract

Colorado Springs, CO, USA is the second largest metropolitan area in the state of Colorado. In the past decade, El Paso County, home to Colorado Springs, has grown by more than 100,000 people, with another 300,000 expected by 2050. The resulting increase in motor vehicle emissions and the city’s proximity to the Denver metro area is intensifying ozone production in this region. Already, the annual mean 8-hour ozone concentration in the area has increased by approximately 5 ppb in the past 15 years. Given that Colorado Springs sits at the base of Pikes Peak in the southern Front Range of the Rocky Mountains, local ozone production is also impacted by complex topography. While there is considerable research on ozone and its origins in the northern Front Range, including the Denver-Julesburg basin, less is known about ozone distribution and production in the Pikes Peak region. During the last five years, mean summertime concentrations measured at two permanent monitoring stations ranged from 36 +/-17 ppb to 47 +/- 12 ppb with a significant increasing trend of 1.1 to 1.5 ppb per year at each site. From June through September 2018, six additional ozone monitors were temporarily added to better characterize the spatial distribution of ozone in the Pikes Peak region. Our goal is to better characterize ozone in the Pikes Peak region, and test the representativeness of two permanent sites in the area. We find that mean ozone concentrations ranged from 34 +/- 16 ppb to 60 +/- 9 ppb. Ozone concentrations increased approximately 1.4 ppb with every 100 meters of elevation, consistent with other studies on the vertical distribution of ozone in the Colorado Front Range and reflecting the production of ozone with increasing distance and airshed age from the more populated lower elevations. Elevated ozone measured on the edge of the city is associated with winds originating from the city center, though topography and katabatic winds also influence this spatial distribution. We find that both permanent sites are biased low and recommend that future sites be placed in higher-elevation areas with relatively high population density. Our results expand current knowledge of ozone behavior in the Colorado Front Range and lay groundwork for monitoring and managing ozone in a growing metropolitan area.

Details

Statistics

from
to
Export
Download Full History