Figure 3.
(A) Picture of a PM10 sample collected from the ambient air (at the rate of 30 m3/h during 8 h) during a Saharan dust event. The samples were collected in a filter, and the ochre colour of the samples evidenced the desert dust nature; the outer white layer is the blank part of the filter (no sample). (B–D) Mean bulk composition of PMx in Tenerife during Saharan dust events according to García et al. [30], highlighting the contributions of desert dust, organic matter (OM), ammonium (NH4+), nitrate (NO3−), sulphate (SO4=) and the undetermined fraction (und). The und fraction is mostly water attached to the aerosols.