  A country-wide `lock-down' imposed on the 23red March 2020 in the UK had a
significant impact on the UK's anthropogenic movements. The closure of
work-places and restrictions imposed on visiting friends and family has
radically reduced the amount of traffic on the roads. In this short
communication, we use data from UK air-quality sensors to quantify air
pollution trends pre- and post-lock-down. While we detect large falls in
nitrogen dioxide at levels not seen over the last decade, trends in other
pollutants were mixed especially when compared to historical data. It suggests
that the implication that lock-down was beneficial for the environment was not
so obvious.
