Figure 2. ATR-FTIR spectra of ozone- and control-treated Ambrosia artemisiifolia pollen.

A shows the averaged absorption spectra of ozone-treated (black; n = 5) and control pollen (grey; n = 6) in a range of wavenumbers between 900–3050 cm⁻¹. Standard errors for these spectra are stated at the bottom of part A in black and grey, respectively. B indicates the Δ-absorption of ozone spectra minus control spectra. Small letters stated in part B are further described in Table 2.