@alrightPET Yep. Four years of negative results, but those were very valuable in guiding method development. Also, a publication showing what didn't work is useful to others in the same field.
@1goodtern We recently flew for the first time since 2019. 10 hour flight, Boeing 777. Aranet was >3000ppm on the ground, stayed 2000-2500 in air, peaked at c. 4000 during meal service (not sure why). Was <1000 in Heathrow T5, which was surprising.