Why are some regions in CA bad in air quality?

  • LA Basin
    • Population: 13.9 million
    • Registered Vehicles: 8 million
    • Source of Pollution: emission from diesel and gasoline vehicles and seaports (Long Beach and Los Angeles)
    • High ozone and PM concentrations
Smog Over Downtown LA
  • San Diego (SD) County
    • Population: 1.4 million
    • Source of Pollution: vehicle emissions in SD, port of SD, pollution across the border from Tijuana, Mexico.
    • High ozone and PM concentration
  • San Joaquin Valley
    • Population: 4 million people
    • Source of Pollution: diesel and gasoline vehicles, agricultural machineries.
    • The surrounding mountains cause the air to be stagnant, which alleviate the pollution problem.
    • High ozone and PM concentration
  • Inland Empire
    • Population: 4 million
    • Source of Pollution: pollution carried by the wind from LA county.
    • Mountains surrounded in the North and East cause the pollution to be trapped in the region.
    • High ozone and secondary organic aerosol (SOA) concentration