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Carbon Dioxide at .033% The only other two sources in the atmosphere are methane and carbon dioxide both of which are much less abundant.
It is mostly found in the atmosphere.
The atmosphere is made of gas molecules.
In the earth's atmosphere.
N2 gas
the ocean
There are a two main sources of dust particles in the atmosphere. A large quantity of dust results from micro-meteoroids that burn up in the atmosphere and turn into dust. In areas of drought, soil can dry up and turn into dust which can then blow away on the wind.
Could be windblown dirt/soil/sand. Could be expulsion from factories and coal fired power plants. Could be volcanic release. Could be micro-meteorites.
You think probable to carbon dioxide.
There are many sources about Virginia. These sources can be found online, in books, or in person from someone who has lived in the area.
The Ionosphere
You think probable to carbon dioxide.
They are found in the Ionosphere.
You think probable to oxygen, nitrogen, carbon dioxide, etc.
Ions
Potassium is not a gas, it is a metal. It is found in mineral salts, not the atmosphere. It can be found in the atmosphere in small enough particles that move via wind currents, ocean spray, ect. but it is not a component of the atmosphere.
Helium can be found virtually everywhere, however, the most common sources are from Uranium ore, due to the decay and release of alpha particles (Helium nuclei). It is also extracted from natural gas sources.