Resources on Air
Introduction to Air Quality
Have you ever wondered what makes fresh air fresh? Try and recall the last time you were at the seaside, or up in the mountains, or in a forest. The air in these locations is perceptibly different from the air that most of us are exposed to on a daily basis, which is an urban environment polluted by traffic and industrial exhausts. Scientists have determined that fresh air consists of certain constituents, and the absence of contaminants. What makes air fresh and invigorating appears to be an abundance of negative and positive ions, and minimal levels of pollutants, especially suspended particles.
However, the opposite is usually true in cities - negative ions have mostly been removed, resulting in unbalanced and excessive positive ions; airborne particles are abundant from vehicles and other industrial processes, along with toxic fumes, germs and allergens. Consequently, not only is the air in cities not fresh, research has conclusively shown that living in such polluted environs can be extremely detrimental to health! Polluted city air is now an accepted fact throughout the world, from Beijing to Buenos Aires, Barcelona to Bangkok. Knowing this to be true is one thing; the challenge is protecting ourselves from the dangers of long-term exposure, a much more daunting proposition. Unlike eating and drinking, where we have the choice of what, when and where we eat or drink, we have no option but to breathe wherever we are ALL the time, regardless of how dirty the air is.
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