Weather Talk: Arctic air has a quality worth investigating
Arctic air has a quality. It has very little moisture in it, and because its source is a vast, largely unpopulated region, it is also very clean.
When arctic air is accompanied by a clear sky, which it often is, the air is as clear and as free of particulates as any air you will ever see. The daytime sky is a deep, almost dark blue. At night, the stars shine with a clarity not seen in milder weather.
Physically, arctic air is very dense, which affects how we hear. Sound waves travel faster and more efficiently in the cold. Meanwhile, snow on the ground, which is usually plentiful when the air is arctic cold, absorbs much of the little noises, so that we can hear more prominent sounds such as train whistles or the hoot of an owl with extreme clarity.
If you have never bundled up and taken a walk on a clear, calm 20 below night, I strongly and coldly recommend it.