If the gifts are deductible, the actual cost of the donation is reduced by your tax savings. For example, if you are in the 33% tax bracket, the actual cost of a $100 donation is only $67 ($100 less the $33 tax savings). As your income tax bracket increases, the real cost of your charitable gift decreases, making contributions more attractive for those in higher brackets.
Small particles of dust and pollution in the air can contribute to (and sometimes even enhance) these colors, but the primary cause of a blue sky and orange/red sunsets or sunrises is scattering by the gas molecules that make up our atmosphere.
This is why light scattered by clouds takes on the same color as the incoming light. For example, clouds will appear white or gray at midday and orange or red at sunrise or sunset. In this way, clouds act as a screen on which natureâs colors are painted. This is why sunsets or sunrises are so much prettier when some clouds are available to show us the colors.