London road traffic NOx emissions still below 50% of pre-COVID-19 levels
CERC continues to run its inverse modelling system (details in our April News item) to determine NOx emissions in London as easing of the lockdown progresses. The latest model calculations up to July 17 show that whilst there has recently been some increase in emissions, they typically remain below 50% of the pre-COVID values. Consistent with this, London road traffic NOx emissions for our airTEXT air quality forecasting using our ADMS-Urban model are currently set at 40% of 'normal'. Resultant forecasted NO2 concentrations are low compared with usual levels but on average are showing a slight overestimate compared with measured values.
A higher resolution graph may be viewed here.