CORRESPONDENCE_2006-2007 - Laserfiche WebLink

Home Browse Search

Table 2-2. Ambient Air Quality Monitoring Data Measured at the Hazelton, Stockton, Monitoring Station Pollutant Standards 2002 2003 2004 Ozone Maximum 1-hour concentration(ppm) 0.102 0.104 0.096 Maximum 8-hour concentration(ppm) 0.081 0.088 .080 Number of days standard exceeded' NAAQS I-hour(>O.12 ppm) 0 0 0 CAAQS 1-hour(>0.09 ppm) 2 3 1 NAAQS 8-hour(>0.08 ppm) 0 1 0 Carbon Monoxide(CO) Maximum 8-hour concentration(ppm) 3.21 3.14 2.51 Maximum 1-hour concentration(ppm) 6.0 5.8 3.7 Number of days standard exceeded' NAAQS 8-hour(>9.0 ppm) 0 0 0 CAAQS 8-hour(>9.0 ppm) 0 0 0 NAAQS 1-hour(>35 ppm) 0 0 0 CAAQS I-hour(>20 ppm) 0 0 0 Particulate Matter(PM10)b National`maximum 24-hour concentration(pg/m3) 87.0 88.0 60.0 National'second-highest 24-hour concentration(µg/m3) 78.0 63.0 56.0 Stated maximum 24-hour concentration(µg/rn ) 91.0 90.0 61.0 Stated second-highest 24-hour concentration(µg/m3) 82.0 64.0 57.0 National annual average concentration(pg/m3) 35.5 28.1 28.6 State annual average concentration(µg/m3)' 36.1 28.4 29.4 Number of days standard exceeded' NAAQS 24-hour(>150 pg/m3)f 0 0 0 CAAQS 24-hour(>50 pg/m3)f 58.4 17.3 18.0 Particulate Matter(PM2.5) National'maximum 24-hour concentration(pg/m3) 64.0 45.0 41.0 National'second-highest 24-hour concentration(pg/m3) 55.0 44.0 39.0 Stated maximum 24-hour concentration(pg/m3) 64.0 45.0 41.0 Stated second-highest 24-hour concentration(pg/m3) 55.0 44.0 39.0 National annual average concentration(pg/m3) 16.7 13.6 13.2 State annual average concentration(µg/m)e 16.7 13.6 13.2 Number of days standard exceeded' NAAQS 24-hour(>65 µg/m3) 0 0 0 Notes: CAAQS = California ambient air quality standards. NAAQS = national ambient air quality standards. NA = insufficient data available to determine the value. ' An exceedance is not necessarily a violation. b Measurements usually are collected every 6 days. National statistics are based on standard conditions data. In addition,national statistics are based on samplers using federal reference or equivalent methods. d State statistics are based on local conditions data,except in the South Coast Air Basin where statistics are based on standard conditions data. In addition,state statistics are based on California-approved samplers. State criteria for ensuring that data are sufficiently complete for calculating valid annual averages are more stringent than the national criteria. f Mathematical estimate of how many days concentrations would have been measured as higher than the level of the standard had each day been monitored. Sources: California Air Resources Board 2005;U.S.Environmental Protection Agency 2005.