Compare the size with the pencil. In principle any sampling technique could be used, other labs might use sampling on charcoal, Tenax, or carbonate in tubes. It's all dependent of what pollutants you are looking for. MDF boards are often used for the construction of show-cases, and other exhibition constructions. However, it's suspected that wood products will emit organic compounds, including carboxyl acids.
Peaks shows traces of formic and acetic acid.
Furthermore, it's possible for us to quantify the emission of the compounds, by comparing the peak area of the material emission to a prepared standard emission sample. These we prepare by injecting a small quantum of headspace vapors of the compound in question into a larger volume of air, in sampling bags made of Teflon.