Massive (30 ppbv) SO2 peak this morning. Not sure what it is due to. Winds were from the West. SB proposed SO2 was from Chicago area fireworks. Something to look into.
Otherwise, SB also discovered that valve was not switching between above and below canopy inlets. So all sampling from yesterday to approximately 0900 today was above canopy only.
At 10:50 today we switched zero length from 10 minutes (600 sec) to 12 min (720 sec) so that auto-zero would include both above and below canopy inlets. We also changed time sampling at each inlet from 10 min (600 sec) to 6 min (360 sec).
Not sure this is the best setup. Something to think about.
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