Start with sample cards and the posted map of monitoring points. It is the source used to decide whether a roof reading describes the air workers breathe at street level; it is not the decision itself. The rule only works if the source describes conditions at the east ward sample posts.
Known: the current file counts 54 samples with a point name and shift recorded, compared with 56 in the prior window. An inspector checks the recorded condition at the work site. The entries have dates and a named clerk.
Disputed: Operators say the roof gives an unblocked regional reading. Workers request a paired street-level sample. One side emphasizes the posted total; the other points to the newest post is on a roof rather than beside the work lane.
Why it matters: the decision determines which residents can rely on the service and which staff must carry out the change. The file does not settle that by itself.
Next: The Year second, cooling weeks window 3 file remains open for its scheduled decision. The next map will mark the height of each sample post.
