A/an occurs when a layer of warm air prevents the rising air from escaping. the polluted air is trapped and held close to earth's surface. temperature inversion clean air act ozone depletion smog alert

Temperature inversion ? I believe that's what you call but in not 100% sure! sorry ):

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.