Character.oldsmoggy
PERFORMER David Rudman
DEBUT 1993

Old Smoggy is a mountain in Monster State Park on which Grover takes some kids on a hiking trip in Sing-Along Earth Songs. The air is so dirty in his environment that a bird living there decides to move back to Los Angeles, a city known for its abundance of smog, suggesting that Old Smoggy's air content has become even worse than the California city.