High Altitude

{
  "name": "High Altitude",
  "page": 110,
  "__prop": "hazard",
  "source": "DMG",
  "entries": [
    "Traveling at altitudes of 10,000 feet or higher above sea level is taxing for a creature that needs to breathe, because of the reduced amount of oxygen in the air. Each hour such a creature spends traveling at high altitude counts as 2 hours for the purpose of determining how long that creature can travel.",
    "Breathing creatures can become acclimated to a high altitude by spending 30 days or more at this elevation. Breathing creatures can't become acclimated to elevations above 20,000 feet unless they are native to such environments."
  ],
  "reprintedAs": [
    "High Altitude|XDMG"
  ],
  "trapHazType": "ENV"
}