this post was submitted on 16 Jan 2024
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That's frozen ice crystals in the air. The humidity being released from the ground due to the contrasting temperatures as well as the air from the building heating systems is freezing in the air. Even your breath literally freezes at these temps.
Combustion also produces water in addition to CO2, so I'm sure all the cars are a big part of it.
What does it do to your lungs when you inhale?
You certainly feel it though it's not super dramatic. As skin starts to freeze anywhere between 10 and 30 minutes in these temps most folks outdoors are bundled up good with skin covered including mouth and nose. For people with asthma it can be difficult. Location and weather leads to very dry air to begin with along with some elevation. Add the temperatures and it kind of shocks your lungs a bit. Your nose hairs freeze immediately, sometimes so quickly it kinda hurts and your breath causes ice to form on your clothes, hair or facial hair around your face.