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

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Carbon Monoxide (CO)Community concerns about the CO concentrations in the Teralta Park area were the impetusfor this monitoring project in City Heights. As stated previously in the Project Description,San Diego County is in attainment of all state and federal air quality standards for CO. Thesestandards are presented in Table 3.Carbon Monoxide StandardsCalifornia StandardsFederal Standards1-Hour 20 ppm 35 ppm8-Hour 9.0 ppm 9 ppmTable 3.State and federal 1-hour and 8-hour ambient air quality standards for carbonmonoxide (CO) in parts per million (ppm).During the entire CO monitoring period the maximum 1-hour CO concentration measured atthe Teralta Park/Central Elementary School sites was 3.1 ppm (January 18, 2009, at 0000PST). The highest CO measured at all San Diego monitoring sites during the entire project,4.6 ppm, was measured at the District’s Otay Mesa site (twice, November 13, 2008, at 2300PST; and January 1, 2009, at 0400 PST).Figure 6 shows the hourly CO concentrations for all monitoring sites in San Diego Countyfor January 18, 2009 (date of highest CO in City Heights for the entire project). The datashown in this graph are for the District’s monitoring sites in Chula Vista (CVA), DowntownSan Diego (DTN – aka Perkins Elementary School), Escondido (ESC), Otay Mesa (OTM),and Teralta Park/Central Elementary School (TEP/CES). Although this graph shows thehighest CO readings for the entire project at City Heights, these data are significantly lessthan measurements at the Downtown San Diego site. This graph also shows the CO in CityHeights to be significantly less than at the Escondido site during the morning commute time(although the commute on a Sunday is very different than on weekdays).All health-based air quality standards for CO are met in City Heights (and elsewhere in SanDiego County). Table 4 presents the maximum 1-hour and project average concentrationsfor the entire monitoring period for this project. This table shows that the City Heights areahas lower CO concentrations than Downtown San Diego, Escondido, and Otay Mesa, andslightly higher concentrations than Chula Vista.- 10 -
Hourly CO Data for: Sunday, 1/18/200940.035.0CO (ppm)30.025.020.015.010.0CVADTNESCOTMTEP/CES1-Hr CO State Std1-Hr CO Federal Std5.00.0Hour (PST)Figure 6.Hourly CO concentrations for Sunday, January 18, 2009 (date of maximum1-hour CO concentration measured in City Heights during the entire project).This graph shows that the maximum CO concentrations measured in CityHeights were well below State and Federal standards. Data gaps shown in theplot are due to nightly zero/span checks.Carbon Monoxide StatisticsCVA DTN ESC OTM TEP/CES1-hour Maximum (ppm) 2.5 4.0 4.4 4.6 3.1Average (ppm) 0.7 1.0 0.9 0.9 0.8Table 4.The maximum 1-hour CO concentration measured at each monitoring site inSan Diego County during this project along with the average concentration.Although it is not necessary to further compare the data against air quality standards, it canbe instructive to look further at the data collected to understand air quality conditions in CityHeights. All future CO plots in this report will be shown with a maximum plot value of 5.0ppm or less (without the standard) in order to show better detail of CO concentrations. Plotsof each day’s CO concentrations can be found in Appendix A.A plot of hourly averaged CO data for the entire project period is shown in Figure 7. Thisgraph shows how morning commutes increase ambient CO concentrations throughout SanDiego County. The morning peaks are then followed by daily minimum values in the- 11 -
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Page 6: PROJECT DESCRIPTIONEarly in 2008, t
Page 11 and 12: Figure 3.Morning wind rose for mete
Page 13: Figure 5.Evening wind rose for mete
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

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