Final answer:
The Almanac is the best source for determining specific altitudes for various locations.
Step-by-step explanation:
The Almanac would be the best source for determining specific altitudes for various locations. An almanac provides information about specific locations, including their elevation above sea level. By referencing an almanac, a person suffering from asthma can determine the altitudes of different locations and find those at higher altitudes to potentially decrease their symptoms. For example, if someone with asthma finds that they have fewer symptoms at higher altitudes, they can use an almanac to identify mountainous regions or cities located at higher elevations.
Learn more about Asthma and altitudes