On a roll now...
Caplecleugh High Level, Archers Vein SE end.
Ramgill, Barneycraig Vein, some of the blind sumps in a few of the sublevels - very poor air.
Barnycraig West End Horse Level were it meets the main BC level coming going outbye 16%. Carrying inbye of the BC main drive past J Edgars Sump 14%.
Barnycraig West End Horse Level heading towards BC main drive in, there is a slight decline on it where the arching is pinching in. The air has been fine on most occasions, but once it was bad and we didn't realise it until coming back up the decline - hard work and one person staggering around and very sweaty - guess weather dependant.
Smallcleugh, going back years now - in the stopes above the HL past Bog Shaft - there are some blind sumps that have bad air.
Mr Mike www.mineexplorer.org.uk