Alessandro Bigi

TL;DR: In this article, the authors analysed the long-term trends of air pollution from a background site in central London and found that ozone has an annual cycle with a maximum in May, influenced by the spring maximum in background ozone, but the diurnal and weekly cycles are dominated by losses through reaction with nitrogen oxide.

TL;DR: In this paper, the reliability of settleable solids in Imhoff cones was addressed as an alternative indirect method to estimate suspended sediment concentration (SSC), verifying the results with the turbidity measures of a laboratory nephelometer.

TL;DR: The Po valley in northern Italy is renowned for its high air pollutant concentrations, and measurements from a background site in Modena, a town of 200 thousand inhabitants within the Po valley, are analysed, showing a strong seasonality with higher concentration in winter and lower concentration in summer and spring.

TL;DR: In this article, the medium term performance of a set of NO and NO2 electrochemical sensors in Switzerland using three different regression algorithms within a field calibration approach was investigated, and the results from the deployment at two distant regulatory urban sites in traffic and urban background conditions, where the performance of the calibration algorithms was explored.

TL;DR: In this article, a data set of PM10 data from 41 sites across the Po Valley have been analyzed, including both traffic and background sites (either urban, suburban or rural) for long-term trend in deseasonalized monthly means, in annual quantiles and in monthly frequency distribution.