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What are the shortcomings of current technologies for monitoring nitrogen dioxide and ammonia?

Nitrogen dioxide and ammonia contribute to the greenhouse effect and acid rain, so their levels in the atmosphere must be monitored in real time. Engineers also need to accurately detect the concentration of these gases in certain locations, such as coal-fired plants where measuring the concentration of these two gases can test the effectiveness of decontamination systems. However, existing detection technologies are costly, difficult to move around, and require high temperatures.