Ozone. Number of Days Exceeding Federal and State 1-Hour Ozone Standards San Diego County

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1 Ozone Number of Days Exceeding Federal and State 1-Hour Ozone Standards Number of Days Exceeding Number of Days Exceeding Previous Federal 1-Hour Standard: State 1-Hour Standard: Maximum 1-Hour Concentration > 12 pphm Concentration >or equals 9.5 pphm Concentration (pphm) 1-Hour Concentration (See note below) Chula Vista /13 10/24 9/20 2/14 10/6 El Cajon /15 10/4 8/16 6/17 6/25 Kearny Villa Rd /13 10/4 4/4 2/14 10/6 Del Mar***** /26 5/15 10/9 3/25 3/14 Escondido*** /13 9/14 4/ Alpine /29 8/30 8/28 8/30 8/30 Downtown San Diego**** /29 10/4 9/20 2/14 - Camp Pendleton /25 5/15 9/20 2/14 10/15 Otay Mesa* /29 5/ Donovan** /5 9/20 6/20 8/31 Basinwide /29 5/15 10/9 8/30 8/30 *Monitoring discontinued in September **Monitoring began in September ***Monitoring temporarily suspended August ****Monitoring temporarily suspended October *****Monitoring ended March Note: The federal 1-hour standard of 12 pphm was in effect from 1979 through June 15, Because this benchmark has been employed for such a long period, and is addressed in State Implementation Plans, we continue to reference the revoked standard for historical perspective.

2 Ozone Number of Days Exceeding Federal and State 8-Hour Ozone Standards Number of Days Exceeding 2008 Federal 8-Hour Standard: Concentration > 7.5 pphm Number of Days Exceeding 2015 Federal 8-Hour Standard: Concentration > 7.0 pphm Maximum 8-Hour Concentration (pphm) 8-Hour Concentration Chula Vista /15 9/15 11/1 9/24 10/6 El Cajon /13 9/13 4/15 6/19 4/22 Kearny Mesa/Kearny Villa Rd /3 10/4 4/29 2/14 10/6 Del Mar***** /26 5/15 10/9 4/19 3/14 Escondido*** /3 5/2 4/4 - - Alpine /14 5/2 6/19 8/30 7/7 Downtown San Diego**** /23 5/2 9/20 10/8 - Camp Pendleton /12 5/15 9/20 2/14 10/15 Otay Mesa* /3 5/ Donovan** /4 9/20 6/19 4/22 Basinwide /14 5/15 6/19 8/30 7/7 *Monitoring discontinued in September **Monitoring began in September ***Monitoring temporarily suspended August ****Monitoring temporarily suspended October 2016.

3 Particulate Matter (PM2.5) Annual Average and Maximum 24-Hour Sample Annual Average Federal Standard: 12.0 micrograms/m 3 State Standard: 12 micrograms/m 3 Maximum 24-Hour Sample* Federal Standard: 35 micrograms/m 3 24-Hour Sample Chula Vista /25 1/11 2/6 3/1 12/27 El Cajon /1 1/1 1/21 12/18 12/31 Kearny Mesa/Kearny Villa Rd /25 1/11 1/21 3/1 12/27 Escondido** /1 12/31 1/3 - - Downtown San Diego*** /26 1/1 2/5 3/1 - * Concentrations are averaged over a 24-hour period. **Monitoring temporarily suspended August 2015.

4 Particulate Matter (PM10) Annual Average and Maximum 24-Hour Sample Annual Average Federal Standard 50 micrograms/m 3 * State Standard 20 micrograms/m 3 Maximum 24-Hour Sample** Federal Standard 150 micrograms/m 3 State Standard 50 micrograms/m 3 24-Hour Sample Chula Vista /21 3/18 9/9 7/23 12/27 El Cajon /4 1/11 9/9 7/23 12/27 Kearny Mesa/Kearny Villa Rd /21 5/11 9/9 9/27 12/27 Escondido*** /27 1/11 1/ Downtown San Diego**** /22 5/11 12/8 3/1 - Donovan /12 10/2 12/8 10/27 12/27 * Federal annual standard revoked December 17, 2006 (Data are shown for continuity with previous reports). ** Concentrations are averaged over a 24-hour period. ***Monitoring temporarily suspended August ****Monitoring temporarily suspended September 2016.

5 Carbon Monoxide Maximum 1-Hour and 8-Hour Average Concentrations Maximum 1-Hour Federal Standard: 35 ppm State Standard: 20 ppm 1-Hour Concentration Maximum 8-Hour Federal Standard: 9 ppm State Standard: 9.0 ppm 8-Hour Concentration El Cajon /12 11/26 1/7 2/8 12/ /9 11/26 1/5 12/19 12/25 Escondido** /1 1/1 1/ /1 1/1 1/1 - - Downtown San Diego*** /18 1/6 12/5 2/ /19 1/11 11/21 2/11 - Carmel Mt. Ranch* /9 10/7 10/ /7 6/19 12/28 *Monitoring began April **Monitoring ended August 2015.

6 Nitrogen Dioxide Annual Average and Maximum 1-Hour Concentration Annual Average (ppm) Federal Standard: ppm State Standard: ppm Maximum 1-Hour Federal Standard: ppm State Standard: 0.18 ppm 1-Hour Concentration Chula Vista /13 11/7 11/19 2/11 10/16 El Cajon /17 11/6 12/9 2/10 12/14 Kearny Mesa/Kearny Villa Rd /13 1/2 12/9 11/8 12/28 Escondido**** /13 10/3 3/6 - - Alpine /17 12/22 1/9 12/15 11/30 Downtown San Diego***** /13 1/16 1/7 10/20 - Camp Pendleton /13 1/17 11/19 3/19 11/21 Otay Mesa* /12 1/ Donovan** /3 2/6 11/8 10/16 Carmel Mt. Ranch*** /20 11/14 11/21 *Monitoring discontinued in September **Monitoring began in September ***Monitoring began in March ****Monitoring temporarily suspended August 2015.

7 Sulfur Dioxide Annual Average and Maximum 1-Hour and 24-Hour Concentrations Annual Average (ppm) Federal Standard: ppm Maximum 24-Hour State Standard: 0.04 ppm Maximum 1-Hour State Standard: 0.25 ppm Federal Standard: 0.75 ppm* 1-Hour Concentration El Cajon /28 11/26 9/19 6/20 12/13 *Federal 1-hour Standard is based on the 3-year average of the 99th percentile of 1-hour daily maximum concentrations.