Meningitis is a disease caused by the inflammation of the protective membranes covering the brain and the spinal cord. While most people with meningitis recover, it can cause serious complications, such as brain damage, hearing loss or learning disabilities. A vaccination is the most effective way to protect yourself against certain types of meningitis.
Primary & Secondary pollutant. Definition: A primary pollutant is an air pollutant emitted directly from a source. A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
1 Cold Air Diffuser â A cold air diffuser uses room-temperature air to blow the oil into a nebulizer where it is vaporized. 2  This diffuser can diffuse quickly and efficiently; however it is noisy and can be a little messy! 3  It also can not effectively diffuse heavier, thicker oils and it is hard to clean.