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Since the introduction of the Putney High Street Low Emission Zone there have been significant improvements in concentrations of NO2 for both the hourly and annual mean.
In 2016, before improvements on the route began there were 403 exceedances of the hourly limit for NO2. In 2017, once the Low Emission Bus Zone was introduced this fell to nine. In 2018 there was insufficient data capture (less than 90 per cent) at the site due to technical issue which resulted in the site being offline for the majority of January and February. In 2019 to date (29 October) there has been good data capture and only 1 hour that exceeded the hourly limit.