The impacts of the ultra low emission zone (ULEZ) and COVID-19 restrictions on air quality in central London – evidence for an increase in small particles (Code)
Description
This research used the ALICE High Performance Computing facility at the University of Leicester. The Detrend.R script utilises the "deweather" R package which is currently in active development (Carslaw D (2025). deweather: Remove the influence of weather on air quality data. R package version 0.7.2.9104, https://openair-project.github.io/deweather/.). The script was written and executed in spring 2024, and has not been amended to reflect the continued development of the package. This script was executed in a Linux environment using R 4.3.1, with a seed of 56117. Analysis was undertaken using predominantly in R 4.5. Modelled wind speed, modelled wind direction, modelled air temperature, NO2, O3, PM10 and PM2.5 data used in this study are publicly available via the UK AIR Data Selector or the “openair” R package. Relative humidity data for St James’s Park, as used in this research, is available via the NOAA Integrated Surface Database (NOAA-ISD) via the “worldmet” R package. MIDAS Open hourly rainfall and solar radiation observations for Kew Gardens, as used in this study, are available via CEDA Archive. Hourly traffic count data for Marylebone Road is available via the responses to two FOI requests made to Transport for London. Particle size and number distribution data used in this study was not rounded to the nearest whole number and is not available publicly, however a rounded version is available via the UK Air Data Selector.
Files
Institutions
- University of Leicester Department of Chemistry