Analysis of two-decade meteorological and air quality trends in Rome (Italy).

Anttila and Tuovinen ( 2010 ) found, in the urban Finnish environment, a net decline of surface SO 2 , CO and NO x concentrations, a limited reduction in NO 2 concentrations and a positive trend for O 3 .

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The air quality data depict a negative trend for C 6 H 6 , SO 2 , CO, NO x , NO and O x .

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The application of the SK test shows that, contrary to Rome downtown, a statistically significant annual trend is not detectable at ML (τ = 0.00, Z = − 0.01 and slope − 0.01 μg m −3 year −1 ) and that only during summer a decreasing trend (τ = − 0.40, Z = 2.54 and slope − 4.80 μg m −3 year −1 ) is observable, perhaps suggesting different photochemical regimes and dynamics.

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