Besides the obvious fact, we all need air to breathe to live, having clean air is of utmost importance to the quality of our lives. I mean without clean air, soil and water, what does it matter what kind of fancy car that we have? If it were up to me, I would find a way to make cars 100 percent pollution free or STOP driving period, since they are one of the top polluters. I am mortified that we have days that the air is so bad we are warned to stay inside. I would gladly be one of the people here on earth that would stop driving cars and anything else necessary to immediately reduce greenhouse gases.