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Sodium bicarbonate, aka baking soda or bicarbonate of soda, is a soluble odourless wNitrogen dioxide is part of a group of gases called nitrogen oxides. In liquid form, it has a yellow-brown tinge; as a gas, it is reddish-brown. More commonly, it is a gaseous air pollutant, made up of nitrogen and oxygen. Its chemical symbol is NO2, and it has an irritating smell. It is highly reactive and is produced from the burning of fuel. This includes the emissions of vehicles (cars, trucks, buses, motorbikes), power plants, and off-road equipment. In an indoor environment, it can be caused from the burning of fossil fuels, including wood or natural gas. (1,2,3,5)
