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During the process of oxidation in the atmosphere this gas forms sulphates or salts that can be transported in the breathable particulate material (PM10) that in presence of humidity forms acids. Later these acids are an important part of the secondary particulate material or finest particulate material (PM2,5).The exposure to sulphates and the exposure to acids derived from SO2 is extremely risky for people's health because these compounds enter the circulatory system directly through the airways.he air pollution by SO2 has the following effects on human beings: 1  Corneal haze. 2  Breathing difficulty. 3  Airways inflammation. 4  Eye irritation. 5  Psychic alterations. 6  Pulmonary oedema.
Edit: SpO2 is the Saturation (peripheral) of Haemoglobin with Oxygen, expressed as a percentage ration compared to fully saturated Haemoglobin (Hb).i.e. when the Haemoglobin (the main oxygen carrying component of blood, found in red blood cells) is fully loaded with oxygen, then is it 100% saturated.t is SpO2, because this is normally measured by placing a probe on the finger which shines red light of two different types through the finger, and a calculation is carried out based on how much of each type of light is absorbed, which tells us how much the Hb is loaded up or saturated.