Visible Light:

The visible part of the EM spectrum lies in the wavelength range of 770 to 390 nm. Emissions at the highest wavelengths emerge red; as the wavelength reduces, we view yellow, blue, orange, green, indigo, and violet in that order.

The visible light is transmitted pretty well via the environment at all wavelengths. Scattering rises toward the indigo, blue, and violet end of the spectrum. This is why the sky emerges blue throughout the daytime. Long-wavelength light is scattered the least; this is why the Sun frequently emerges red or orange whenever it is on the horizon. Red is the favored color for terrestrial line-of-sight laser communications systems for similar reason. Snow, rain, fog, smoke, and dust interfere with the transmission of visible light via the air.