None of the monitoring sites are in locations where traffic is completely blocked and reductions in nitrogen dioxide concentrations would be likely to be much larger where no traffic is able to pass at all as has been seen during other road closures.

There is little evidence of any significant increase in nitrogen dioxide concentrations in areas neighbouring those where the protests are taking place.

The difference in concentrations well away from the affected areas is inconsistent and reflects possible increases in pollution due to meteorological conditions, offset by the possible decreases in concentrations due to lighter traffic in the school Easter holidays.