Add: "(measured at 1.2-1.8 m [4-6 ft] above the floor)" after "once an hour"
Posted on:06 May, 2016 Amendment:
In Part 1 description, change “Monitors measure 2 of the following pollutants in a regularly occupied space…” to “Monitors measure 2 of the following pollutants in a regularly occupied or common space…”
