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Published: Sunday 04 August, 2013

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As Paracelsus 1493 1541 stated, the toxicity of many materials, including the common greenhouse gases, are dependent on exposure concentrations and time. Some have workplace exposure limits and controls. A brief review indicates:Non toxicAt levels above 5%, concentration CO2 is directly toxic. Exposure to higher levels may cause unconsciousness or death within minutes of exposure. At lower levels the effects are more related to asphyxia and may include symptoms such as headache, increased heart rate, dizziness, fatigue, rapid breathing, visual and hearing dysfunctions. is not toxic but has problems related to explosivi shop womens shoes ty. High concentrations may lead to asphyxiaThe National Institute for Occupational Safety and Health NIOSH has established a recommended exposure limit REL for nitrous oxide of 25 parts per million ppm parts of air 45 milligrams per cubic meter mg/m3 as a timeweighted average TWA for the duration of the exposure. The NIOSH limit is based on the risk of reproductive system effects and decreases in audiovisual performance8 hour per day/5 days per week occupational exposure limit 0.1 ppm15 minutes short term exposure limit shop womens shoes 0.3 ppmThe acute and chronic effects of excessive exposure to ozone have been well investigated. has been shown to be more injurious at concentrations exceeding 2.0ppm over several hours, such as experienced by gas shielded arc welders. The primary site of acute effects is the lung which is characterized by pulmonary congestion. Overexposure may shop womens shoes cause dizziness, loss of concentration, Central Nervous System CNS depression and/or cardiac arrhythmia. shop womens shoes

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