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

More documents

Recommendations

Info

CONCLUSIONSThis study measured carbon monoxide (CO) and fine particulate matter (PM2.5) at severallocations in the community of City Heights during winter months, when both pollutantstypically reach their annual peak concentrations. The study found that CO and PM2.5 exhibitsimilar patterns to other locations in the County, and that the measured concentrations fallmid-range to other San Diego sites for both pollutants.CO levels at all monitoring sites in San Diego, including City Heights, meet all state andfederal air quality standards. In fact, measured levels were well below the standards. TheCO measurements, in close proximity and on both sides of SR-15, found concentrations thatwere less 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 topography for cold air to settle and trap pollutants in the surfacelayer. This combination of meteorology and geography contributes to good air quality inCity Heights.Based upon the official FRM sampling, the 24-hour PM2.5 standard was exceeded in CityHeights on two days during the study (New Year’s Day and the following day, when thehighest particulate concentrations are frequently measured in the County). City Heights hadthe lowest PM2.5 concentration of all monitoring sites on New Year’s Day, when all sites inSan Diego County exceeded the 24-hour standard (see Figure 18 and Table 8).The PM2.5 data collected at the City Heights’ locations exhibit similar patterns to other areasof the County, with concentrations in City Heights mirrored by concentrations in otherlocales. This indicates a strong correlation to atmospheric conditions and regional air qualitypatterns; not a locally-based problem.Similar to other locations in San Diego County, the daily PM2.5 averages in City Heights arestrongly influenced by night and morning concentrations, where atmospheric stability playsan important role in surface concentrations. During the day, when local traffic, and thereforeemissions, is highest, surface concentrations tend to be at their low point in the diurnal cycle.The PM2.5 measurements in City Heights are consistent with longer-term measurements inother monitoring sites in San Diego County, falling mid-range between other locations.Along with the rest of San Diego County, City Heights meets the federal air quality standardsfor PM2.5.- 26 -
San Diego County FRM PM2.5 Data (Interpolated):December 20, 2008, through January 29, 200970.0PM2.5 (µg/m3)60.050.040.030.020.010.0CVA PM25ECA PM25ESC PM25KMA PM25DTN PM25CES PM2524-Hr Std0.0DateFigure 18.Graph showing the daily PM2.5 concentrations measured by FederalReference Method (FRM) from December 20, 2008, through January 29, 2009(data are shown in “interpolation” mode so that data for sites on 3-daysampling cycle will be shown).- 27 -
Page 2 and 3: THIS PAGE INTENTIONALLY LEFT BLANK
Page 4 and 5: THIS PAGE INTENTIONALLY LEFT BLANK
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: Central Elementary School and Wilso

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

Create successful ePaper yourself

Delete template?

Save as template?