It is poisonous in large amounts, and the gas is poisonous (but not in small amounts).
Atmospheric sulfur dioxide that dissolves in it on its way down.
Sulfur dioxide is formed by the combustion of sulfur. One of the principal ways of leakage of sulfur dioxide to air is through the sulfuric acid industry. Another way is the burning of material which are made out of vulcanized rubber that contains sulfur.
Sulfur dioxide can get into the air through natural processes like volcanic eruptions, as well as through human activities such as burning fossil fuels, industrial processes like metal smelting, and transportation emissions from vehicles.
Using a method called flue gas desulphurisation which involves the addition of a calcium oxide. The calcium oxide basically absorbs the sulphur dioxide on its way out of the flues; economically, useful products are produced such as gypsum which can be used as plaster.
Biologically, 'too much' of it is toxic [poisonous or lethal]; while environmentally, too much of it is [only] one cause of the Greenhouse Effect.
About the only way sulfur dioxide gas can be removed from the atmosphere is by washing it out with water. But water and sulfur dioxide create sulfuric acid, and you'll have acid rain. There really isn't a "good" way to remove SO2 from the air. It is best to try to keep it out of the air in the first place. Most SO2 enters the air through the burning of fossil fuels with sulfur in them. The so-called "refined" fuels like gasoline don't contain sulfur, but coal and fuel oil and a number of other fuels do. Where coal and fuel oils are used commercially (in large quantity), we try to scrub the stack gases to grab the sulfur, but it is costly and difficult.
Sulfur, in its elemental form, is already stable. It does not have to be stabilized or treated in any way to maintain its stability.
Sulfur melts at a much lower temperature than sand. That might be useful. Also, there are solvents which will dissolve sulfur but not silicon dioxide. Finally, there's always the magnifying glass and tweezers method.
It is part of the exhaust system. It can be anywhere between the exhaust manifold and the muffler. It is usually half way between the manifold and the muffler. Some cars have two. The purpose of the converter is to change the carbon monoxide in the exhaust to sulfur dioxide. Carbon monoxide is a greenhouse gas and sulfur dioxide is not.
Oh, dude, that's a classic combustion reaction! When you mix sulfur with oxygen and add some heat, you get the party started with some sulfur dioxide. It's like chemistry's way of saying, "Let's heat things up and make some smelly gas!"
Yes
They are not alike in any way, Because of the carbonic sulfur.