What is Altitude Sickness or Acute Mountain Sickness? Will it happen to me in Breckenridge?

Altitude Sickness is Caused By A Decrease In Oxygen Levels at the high altitude in Breckenridge

Chart below shows the amount of oxygen at altitude – note how it decreases as you go up in altitude:

Oxygen at Sea Level: 0 feet
Oxygen in Denver, CO: 5,280 feet above Sea Level
Oxygen in the town of Breckenridge: 9,600 feet above Sea Level
Oxygen at the Summit of Breckenridge: 12,998 feet above Sea Level