Air quality and human health - Air Pollution Modeling and Its Application - page 491

There are few areas in the AOT40 trend maps with trends greater than their
estimated uncertainty. There are large areas in the SO 2 trend maps with negative
trends greater than their estimated uncertainty.
Fig. 3. Maps showing the ratio of the absolute trend to the standard deviation of the trend for
AOT40 (left) and annual mean SO 2 (right) for the years 1996-2005. The standard deviation of
the trend is calculated using Monte Carlo methods
Acknowledgments This work was carried out by the European Topic Centre on Air and Climate
Change on behalf of the European Environment Agency.
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