Air Quality in San Diego County NACAA Fall Membership Meeting, 2007

2 America’s Finest City

3 Snapshot of San Diego County 4,200 square miles – 70 miles of Coastline 3.1 million people 1.6 million jobs 2.2 million vehicles 84 million daily VMT

4 Inversion Layer Photochemical Smog Ocean Breeze Build-Up of Ozone Los Angeles San Diego

APCD separates from Health Department 1981 Attains federal annual NO2 standard1992 State standard 1956 Monitoring began at San Diego Public Library1955 Board activates APCD 1975 First to require vapor controls at gas stations 1985 Monitoring began for air toxics 2003 Health alerts during and after firestorms 1991 Last Stage 1 Smog Alert1979 Last Stage Annual federal PM2.5 standard attainment 2003 Attains federal 1-hour ozone standard 1995 Attains State CO standard1998 Federal standard

YEARS Vehicle Miles Traveled (millions/day) Countywide Population (100,000s) Days Over Federal 8-Hour Ozone Standard Air Quality Improves Despite Growth

7 Lawnmower Exchange

8 School Bus Retrofits

9 Transborder Truck Retrofits

10 Challenges

Thank you.