You are right on the edge of it being a problem. That's at 4900 ft. But just cause you are below that doesn't mean you don't have to take precautions.4,751
The oxygen is still there but the air pressure is lower which causes the air molecules to fly around faster. That will affect humidity, oxygen, weight loss and temperature.
This may help.
Incubating Eggs at High Altitudes | The Poultry Site
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