A group and I have the opportunity to design a payload that will be sent up some 100,000 ft (~ 30 km) into the atmosphere for approximately 3 hours. In our design, we were going to include gas sensors so that we can measure gas intensity levels as we go up in altitude. Here are four gas sensors we were thinking of getting:
What other gases would you consider useful for studying about pollutants and the greenhouse effect? Are there any above that wouldn't be very useful?