Evolution of NO2 levels in Spain from 1996 to 2012 and UVAS retrieval algorithms
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Evolution of NO2 levels in Spain from 1996 to 2012 and UVAS retrieval algorithms
We report the evolution of tropospheric nitrogen dioxide (NO2) over Spain, focused on
the densely populated cities of Barcelona, Bilbao, Madrid, Seville and Valencia, during
17 years, from 1996 to 2012. This data series combines observations from in-situ air quality
monitoring networks and the satellite-based instruments GOME and SCIAMACHY. The results in
these cities show a smooth decrease in the NO2 concentrations of ~2% per year in the period
1996-2008, due to the implementation of emissions control environmental legislation, and a
more abrupt descend of ~7% per year from 2008 to 2012 as a consequence of the economic recession.
In the whole Spanish territory the NO2 levels have been reduced by ∼22% from 1996 to 2012.
Statistical analysis of several economic indicators is used to investigate the different
factors driving the NO2 concentration trends over Spain during the last two decades.
We also report the current state of UVAS instrument algorithms development for
NO2, HCHO, SO2, BrO and IO species.