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Light travels by 299,792,458 m/s in vacuum.
Often just c = 3,00 * 10 ^8 m/s
In earth atmosphere just above sea level, the light speed is estimated to be just about 90 km/s slower than in vacuum, so:
299,792.458 km/s - 90 km/s
= 299,702.458 km/s
= 299,702,458 m/s
~ 3,00 * 10 ^8 m/s (still).
There is therefore no practical difference between lightspeed in air and in vaccum. Unless perharps you're designing a GPS, so you'll have to consider general relativity.
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