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Physical fitness as we know it today is miles from which it began. It began as simply survival then converted into preparation for war then began some very early competitive sports. Later it became philosophical since the body was admired for its beauty and strength. For a brief time, the main objective turned to preparation for war and after that it ventured into a medical standpoint as the great things about health and fitness came to light. Then we became sedentary and began to recognize the requirement for physical fitness in different ways. Thoughts on the other hand turned time for competitive sports and, next few centuries, evolved into the present day day revolution that people see and hear a lot about. Physical fitness has evolved in the centuries from basic survival to health awareness. Airborne particulate matter can be a complex mixture of organic and inorganic substances which might be divided into two groups: coarse and fine particles. The fine particles include formed aerosols (gas that looked to particles), combustion particles, and metal vapors. The large particles are items like dust in the road or a factory. The fine particles are the ones most directly associated with acid rain and people are the ones we are likely to deal with today. They have one of the most relevance on the new laws in California regulating the emissions from semi-tractor trailers. While Santa Cruz is not a big city, you will find there's major artery, highway 1 which runs through our lovely ocean side communities in addition to mining in high altitude which generate particulates too. A tighter built home means less outside air infiltrating in the home, which means less oxygen to use for combustion within the furnace. As the furnace burns fuel and oxygen for combustion, it "eats up" surrounding air, which has to be "made up" with fresh air. If air cannot type in the home as easily anymore, this can cause serious issues. As the surrounding air is utilized for combustion, rather than substituted with oxygen, a negative pressure inside the space can happen. This could create combustion problems for the furnace, plus burn up fresh air for anybody inside the home.