https://publiclab.org/notes/megan/4-2-2012/possible-sensor-field-calibration-photo-test-strips shows some ~$200 wearable electronic sensors for H2S:

Also see this post by @megan: $20 a day from Safety Alliance in Farmington, (505)-325-7233 I have included this link to information on the Gas Badge Plus http://www.durawear.com/index.cfm/a/catalog.prodShow/vid/485/catid/145 That link is broken, but this worked: http://www.amsequipment.com/gas-detection-equipment/portable-monitors/gasbadgeplus Also found this one, the MSA Altair, and a few others on the Duraware.com site above (although the others were over $1000) $99: https://www.durawear.com/msa-altair-h2s-hydrogen-sulfide-single-gas-detector-low-alarm-10-ppm-high-alarm-15-ppm-mfg-10092521/

And read about air grab sampling as the Louisiana Bucket Brigade and other bucket brigades do: https://publiclab.org/wiki/air-sampling