don't smoke, excercise, espessially walking.
An increase in oxygen level can be caused by processes such as photosynthesis in plants, diffusion of oxygen into water from the atmosphere, or release of oxygen during chemical reactions. Human activities may also contribute to an increase in oxygen levels by reducing pollution or planting trees that produce oxygen.
Because due to the over pollution and cutting down the tree's level of Oxygen is decreasing .The level of Nitrogen always remains constant in the atmosphere . The level of Nitrogen doesn't' depend on the level of the Oxygen level.
Oxygen, produces it.
The existence of plant life is the primary reason oxygen is found in the atmosphere of the Earth.
Processes that increase carbon dioxide in the atmosphere include burning fossil fuels, deforestation, and industrial activities. Photosynthesis by plants and algae is a key process that increases oxygen in the atmosphere.
An oxygen deficient atmosphere has an oxygen concentration less than the normal level of around 21%.
There is oxygen in the atmosphere of Saturn, but it is only a tiny fraction of the deep atmosphere, which is mostly hydrogen. It is not in a usable form as is oxygen on Earth.
The increase in oxygen in Earth's atmosphere is mainly due to the evolution of photosynthetic organisms like cyanobacteria and plants, which produce oxygen as a byproduct. Over time, these organisms gradually increased oxygen levels through the process of photosynthesis. This led to the rise of oxygen in the atmosphere from less than 1% to the current level of around 21%.
Photosynthesizing prokaryotes affected the ancient atmosphere by adding oxygen. In ancient times the oxygen level was .42%, compared to the 21% oxygen level now. Photosynthesizing prokaryotes have made the world livable today.
The amount of oxygen in the atmosphere increased because the number of photosynthetic organisms, which release oxygen, on the earth dramatically increased. This lead to the Great Oxygenation Event, or the Oxygen Crisis, 2.4 billion years ago - when this free O2 entered the Earth's atmosphere.
The minimum amount of oxygen needed to sustain a fire in the atmosphere is about 16% oxygen. Below this level, the fire would not have enough oxygen to continue burning.
The current oxygen concentration in the Earth's atmosphere has been relatively stable at around 21% for the past 300 million years. This level is maintained through processes like photosynthesis by plants and phytoplankton, which convert carbon dioxide into oxygen.