In 2012, administrative assistants averaged $33,560 a year, according to the Bureau of Labor Statistics. But this figure accounts for all administrative support, regardless of employer.Those working for dental offices averaged closer to $35,020.With training as a medical secretary, administrators working in dental offices can expect even higher salaries, at an average of $36,960.hose working for dental offices averaged closer to $35,020. With training as a medical secretary, administrators working in dental offices can expect even higher salaries, at an average of $36,960.
Human Sources of Sulfur Oxides; Wood Smoke; Contributors; It has been estimated that on a global basis, natural sources, such as volcanoes, contribute about as the same amount of sulfur oxides to the atmosphere as human industrial activities. This amounts to 75-100 million tons from each source per year. However, in industrial countries such as in Europe and North America, human activities contribute 95 % of the sulfur oxides and natural sources only 5 %. In the Western States, natural sources of sulfur oxides may be more important.
On the other hand, carbon monoxide is the result of incomplete combustion in the carâs engine which in turn can cause high levels of oxygen. Common Reasons. There are certain causes of gas related smog check failures for each of these gases. Common causes of high levels of NOx or Nitrogen Oxides include advance timing and a faulty EGR system. The EGR System or Exhaust Gas Recirculation System is the main component in the exhaust gas recirculation system.