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Non-polar gas molecules such as nitrogen and oxygen, which make up around 98% of the air, are not very soluble in water. There are two possible reasons why a standing glass of water will form bubbles if left over time.

If you pour a glass of water you mix in additional gas to it which as the water / gas mixture returns to equilibrium, starts leaving solution (imagine oil sitting on water, stirring the two, and then watching the two separate again, the air above the water surface is like the oil in this case).

Also as the temperature of water rises, the gas solubility falls and so they start to form bubbles out of solution. Water out of a tap may be cooler than the room. As the water warms up gas solubility falls, the equilibrium shifts, and gas and water start to separate.

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