Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations

Contact Us Search: All EPA Region 9

• You are here: EPA Home
• Region 9
• Air
• Air Quality Trends
• Lead Concentrations (1976-2004)

Lead Concentrations
Air Quality Trends (1976-2004)

Air Quality Trends Quick Finder
Air Quality Trends Home Carbon Monoxide (CO) Lead (Pb)	Nitrogen Dioxide (NO2) Ozone (O3) Particulate Matter (PM2.5)	Particulate Matter (PM10) Sulfur Dioxide (SO2)

National Standard
Highest Quarterly Average Concentration

Region 9 Topics and Programs | A-Z Index

Local Navigation

• Region 9 Home
• Region 9 Air Home

---

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

• EPA Home
• Privacy and Security Notice
• Contact Us