This reminds me of some work I heard about a few years ago, monitoring the emissions of automobiles as they drive past a mobile monitoring station. I believe the tailpipe emissions were monitored spectroscopically using a $10 black body source (an ignitor from a gas dryer), a series of infrared filters (to select wavelengths for detection) and a detector.

This technique could probably be applied to general atmospheric monitoring, though the fluctuations will be lower if you're probing well mixed air and not at the source of the emissions.

Here's the reference I found.

Environ. Sci. Technol. 2000, 34, 1110-1116

Good luck!

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