Related Clues:

• Govt. emissions watchdog
• Smog-monitoring gp.
• Air pollution watchdog
• Toxic-level monitor: abbr.
• Org. that holds the Masters
• 'Go Green!' newsletter org.
• Lead watchdog: abbr.
• Org. with the blog Greenversations
• One of golf's ''majors''
• MPG agency
• Pollution watchdog grp.
• Pollution-fighting gp.
• Org. concerned with PCBs
• Org. with a tour
• Org. for Tiger Woods: Abbr.