Bureau of Automotive Repair (BAR):

• Find Smog Check History (by VIN or License Plate)
• Consumer Assistance Program
• Things to Know About Smog Check
• Buying a Clean Air Car
• Going Green
• Smog Check Reference Guide

Department of Motor Vehicles (DMV):

• Online Registration Renewal
• Smog Certification Requirement
• Out-of-state Vehicle Smog Check
• DMV Smog Check FAQ:
  • Smog Information
  • Exempt Vehicles
  • Smog When Selling a Car
  • Failing to Pass Inspection
  • Counties Requiring Inspection
  • Military Exception
  • New Car Rules
  • Owner Transfer to Family Member

Air Resources Board (ARB):

• Vehicle Buyback Program
• Report a Smoking Vehicle
• Air Quality Maps

Department of Consumer Affairs (DCA):

• Find Licensed Repair Dealers

California's Climate Change Portal:

• General Information

Environmental Protection Agency (EPA):

• Carbon Footprint Calculator
• Emissions Reduction Fact Sheet

Various

• National Air Quality Info
• Green California!
• Fuel Economy Info