• You are here: EPA Home
• Pacific Southwest
• Air
• Quality Analysis
• Trends
• Lead Concentrations

Air Quality Analysis

Air Quality Trends (1976-2004)

Lead Concentrations

National Standard
Highest Quarterly Average Concentration

• View a larger version of this map (GIF, 179K)
• View a high resolution PDF version of this map (PDF) (1 pg, 438K,  About PDF)

Area Navigation

• Pacific Southwest
  Air Home

  ---

• Air Quality Analysis
  • Today's Air Quality
  • Air Quality Maps
  • Air Trends
  • Exceptional Events
• Air Permits
• Air Plan Actions
  • Arizona
  • California
  • Gila River
  • Hawaii
  • Navajo Nation
  • Nevada
• Tribal Air
• SIP Rule Collection
• Alternative Test Methods
• Air Delegations
• State & Local Contacts
• About Us
• Air Archive

  ---

• About EPA Region 9 (Pacific Southwest)
  •  • News & Events
  •  • A-Z Index