Approximately what decibel is full volume on iPhone?

I love to listen to my music loud. I have Apple earpods and and iPhone 4. I just wanted to know what decibel is full volume through earpods.

"Tips to Avoid iPod Hearing Loss":
http://ipod.about.com/od/generalmaintenance/a/avoiding-ipod-hearing-loss.htm

Even though most of us don't think too much about it, iPod hearing loss is a serious risk for many iPod users.
A growing body of research is showing that how we listen to our iPods can cause lasting hearing damage.
The iPod can produce a maximum of 100 to 115 decibels.
Software limits European iPods to 100 dB.
US Models have been measured higher, which is the equivalent of attending a rock concert.

"High volume, prolonged earphone use can damage hearing":
http://www.usatodayeducate.com/staging/index.php/pulse/high-volume-prolonged-earphone-use-can-damage-hearing.

Cheers ebs