The field of mind-body studies includes research on the relationship between our surroundings and our health. Studies show that a healthy and pleasing environment (like plants in your office, or a treasured photograph on the wall) can do more than simply improve your mood--it can actually affect your immune system and physical health.
Water is the control.......
Air pollution is an example of a environmental hazard. Air pollution is caused by the burning of fossil fuels. Pollution is also caused by the gases released from factories and cars. Air pollution leads to many breathing problems, one being asthma. It can also cause global warming. Last, some of the harmful chemicals can cause acid rain. These are a few of the many effects of air pollution.
I believe that the best answer among the choices provided by the question is the second choice , evaporation
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