Anchor: In addition to recognizing the complex atmospheric chemistry relevant for some pollutants, air quality modelers also must deal with uncertainties associated with variable meteorology and the spatial and temporal distribution of emissions.
Entailed: It's important that air quality modelers are capable of accessing a wide range of variables. 
Contradiction: Air quality modelers do not need to interpret atmospheric chemistry. 
Contradiction: Someone is sitting on the stage.
Contradiction: My friend, that is an exonomist will tell me if the programming will pay off once done. 
Contradiction: grils are playing
Contradiction: A man and woman serving food.