contributor - something that adds to a problem or solution, major - Important or big, motor vehicle - machine you drive, e.g car, bus or truck, source  - The origin of something, has led / could lead to - Linking verb to show result or effect, scientists - An expert/professional in the subject of science, residents - Person who lives in a specific area/place, particle - A very small part of an object/substance (In physics, an atom or nucleus), micron - size: 1/1,000,000 of a metre (micrometre), long-term - For a long period of time, [be]more likely to [do] - Something will probably happen (or usually happens), asthma - An illness which sometimes makes breathing very difficult,

8.2 Air Pollution Vocabulary

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