City Heights CO and PM2.5 Data Analysis Report - Air Pollution ...

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EXECUTIVE SUMMARYAt the request of the community of City Heights, measurements of carbon monoxide (CO)and fine particulate matter (PM2.5) were made at several locations between November 2008and February 2009. The study found that CO and PM2.5 levels exhibit similar patterns toother locations in the County, and that the measured concentrations fall mid-range to othersites for both pollutants.Carbon monoxide concentrations were well below all air quality standards during the entirestudy. The measured CO concentrations in close proximity and on both sides of SR-15 wereless than other areas of the County where population density, traffic, topography, andmeteorology result in higher concentrations. City Heights is in an area with adequateventilation and without deep pockets for cold air to settle and trap pollutants in the surfacelayer. This combination of meteorology and geography contributes to good air quality inCity Heights.The PM2.5 data collected in City Heights exhibit similar patterns to other locations in theCounty, with the highest concentrations in City Heights mirrored by higher concentrations inother locales. This indicates a strong correlation to atmospheric conditions and regional airquality patterns; not a locally-based problem.Similar to other locations in San Diego County, the daily PM2.5 average levels in CityHeights are strongly affected by night and morning concentrations, where atmosphericstability plays an important role in surface concentrations. During the day, when localtraffic, and therefore emissions, is highest, surface concentrations tend to be at their lowpoint in the diurnal cycle.The PM2.5 measurements in City Heights are consistent with longer-term measurementsfrom other monitoring sites in San Diego County, falling mid-range between other locations.City Heights therefore meets the federal air quality standards for PM2.5, along with the restof San Diego County.Based upon the results of this study, no further air quality monitoring is warranted in CityHeights.- 1 -
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Page 6: PROJECT DESCRIPTIONEarly in 2008, t
Page 11 and 12: Figure 3.Morning wind rose for mete
Page 13 and 14: Figure 5.Evening wind rose for mete
Page 15 and 16: Hourly CO Data for: Sunday, 1/18/20
Page 17 and 18: San Diego Hourly CO Data Averages b
Page 19 and 20: San Diego Hourly CO Data Averages b
Page 21 and 22: Hourly CO Data for: Thursday, 1/1/2
Page 23 and 24: TEP/CES CO Averages by Day of Week
Page 25 and 26: Central Elementary School: FRM vs.
Page 27 and 28: The District operates five BAM unit
Page 29 and 30: Central Elementary School and Wilso
Page 31 and 32: San Diego County FRM PM2.5 Data (In

City Heights CO and PM2.5 Data Analysis Report - Air Pollution ...

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