In the following statements about the sources and distribution of NOx emissions set each gap to the correct option.
About this exercise type...— Most NOx emissions result from _.
— Emissions that result from human activity are known as _ emissions.
— NOx emissions resulting from human activity usually take the form of _.
— Most NOx emissions occur in the _.
— Some emissions, such as those caused by aircraft, can take place in the entire _.
— NOx transfer between the _ and the _ is difficult to evaluate and model.
— Lightning is a _ source of NOx emissions. Lightning emissions can take place in the entire _.
— Their intensity and location is _.
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