Um, well, being able to breathe is a pretty good indicator.
Scientists also use sophisticated measuring and imaging technology to determine this. All planets have some sort of atmosphere, and sampling that atmosphere and chemically analyzing it at different altitudes can help prove the "thick blanket of air".
Help me!
The blanket of air on Earth, known as the atmosphere, is about 62 miles (100 kilometers) thick. The majority of Earth's atmosphere is contained within the first 18 miles (30 kilometers) from the surface.
Something that is covered. By google eg The haze is like a thick blanket.
Joemama boomer
No, a duvet cover is not thick enough to do much good. Use a comforter or another blanket.
Stratus clouds cover the sky like a thick blanket, typically bringing overcast conditions and sometimes light precipitation. They are low-lying clouds that can stretch for long distances.
Ozone Layer
nothing
When it's cold, I use a thick, cozy blanket or a comforter to cover myself in bed. A weighted blanket can also provide extra warmth and a sense of security. Layering with soft sheets and a warm throw can enhance comfort as well. Sometimes, a heated blanket is a great option for those particularly chilly nights.
an extreamly thick one
Haze
The type of cloud that is low and blanket-like is called a stratus cloud. Stratus clouds often cover the sky in a uniform layer, resembling a thick blanket. They are typically found at low altitudes and are associated with overcast or gray sky conditions.