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www.reference.com/science/humans-need-air-bf5d1d5e4cbdd165

Human beings require air because, like all other animals, they are aerobic organisms who require oxygen, which is a component of air. While oxygen is found in water, humans evolved to extract the oxygen from air, as birds, mammals and reptiles do, instead of from the water, as fish and some amphibians do.

www.faqkids.com/605-breathe-air-live.html

Why do we need to breathe air to live? A: The simple answer to this question is that we need oxygen. But I have a feeling you are looking for a more complex explanation. So here goes: All the processes in your body require energy. This energy is made inside your cells and is in the form of a molecule called ATP. Just about everything takes ATP.

www.quora.com/Why-do-we-need-air

We don’t need “air;” we need the oxygen that is in the air. The rest of the air is “filler;” gases that take up space, if you will. We do not process the nitrogen, for instance, that makes up as much as 80% of the air we breathe. It just goes into our lungs and pretty much right back out—unchanged.

www.reference.com/science/need-fresh-air-2fc79d6233eba7ab

Humans need fresh air because it cleanses the lungs and improves metabolic rate, blood pressure and heart rate, according to Pillars of Health. Fresh air also strengthens the immune system, soothes nerves, stimulates appetite and digestion, facilitates sleep, improves concentration, and clears the mind.

www.answers.com/Q/Why_do_humans_need_air

Squirrels need oxygen, just as humans do, so they breathe in air much the same way as humans do. Squirrel blood cells need oxygen to operate their muscels, bones, and anything else in their body ...

www.vitalitymedical.com/to-air-is-human-why-your-body-needs-oxygen

Oxygen is all around us in the air that we breathe, and that is a good thing because we could not live without it. In fact, oxygen is so important that it will lead to death if we are deprived of it for only a short time. Why do we need oxygen and how do our bodies acquire it? Let's take a look.

www.cleanair.ca/news/n00july_needcleanair.html

Why do we need clean air? In Ontario 1,800 people die prematurely each year due to poor air quality. The number of "smog alert days" during the summer of 1998 doubled from the previous year, putting millions of people’s health at risk, particularly young children, the elderly and those with asthma and respiratory illnesses.

sciencing.com/importance-air-6330367.html

While in popular terminology "air" is often conflated with "oxygen," air actually consists of oxygen and a mixture of other gases, such as nitrogen, methane and carbon dioxide. Air is an important part of several essential cycles that also make life on Earth possible.

www.mfe.govt.nz/more/environmental-reporting/air/air-domain-report-2014/why-good-air...

Good outdoor air quality is fundamental to our well-being. On average, a person inhales about 14,000 litres of air every day, and the presence of contaminants in this air can adversely affect people’s health (see figure 4). People with pre-existing respiratory and heart conditions, diabetes, the young, and older people are particularly vulnerable.

www.youtube.com/watch?v=LM_CgtFORzw

Everyone breathes, but why is oxygen important? Whether the topic is popcorn or particle physics, you can count on the HowStuffWorks team to explore - and ex...