We investigate the epiphytic diversity of lichens and bryophytes in Lisbon and Tagus Valley area.
Field studies were carried out in the years 2010–2011 to replicate studies conducted 30 years ago.
We reveal trends in the species’ distribution, in view of recent changes.
We estimate changes in floristic richness (FR) linked to air quality and Index of Human Impact (IHI).
Using geostatistical modelling we outline present-day air quality based on floristic classes.