AIR POLLUTION – MONITORING MODELLING AND HEALTH

Bio-Monitoring of Air Quality Using Leaves of Tree and Lichens in Urban Environments 231
road traffic, the slope causes the engine to develop more power and reject more pollutants.
The slope therefore causes a significant increase of emissions (Madany et al, 1990).
Moreover, for all sites measured, equal concentrations of copper were observed (0.01±0.00
µg/g) between the urban and the control cypress, where it can be assumed that copper
accumulation from road traffic is absent in the leaves of this species.
Fig. 3. Comparison of trace metals contents (Pb, Zn, Cu) between control and polluted sites.
2.2.3 Relationship between trace metals contents (Pb, Zn, Cu) and urban sites
In this section, we conducted a correspondence analysis by addressing the relationships
between variables: concentrations of trace metals (Pb, Zn, Cu) and contaminated sites by
these elements. First of all, we have a table with one entry consisting of data from four sites
(two measurements per tree, six measurements per site), then the variables said lines (four
sites) were linked to the values concentrations of trace metals called variable columns with a
cross table.
For this analysis, the percentages of inertia explained by each axis, were considered,
including the relative differences have to know the number of axes that can be interpreted.
The results of this Factorial Analysis of Correspondence are shown in Figure 4.