Recent concentrations of nitrogen dioxide are shown in the map below. Dots displayed in yellow or red indicate that the air quality objective is being breached at these locations.

To understand the air quality problem in Bristol, we have collected data from an extensive monitoring network in the city. Bristol City Council monitors NO2 using a combination of automatic and non‐automatic (passive diffusion tube) monitoring.
In Bristol’s recent Annual Status Report for 2017, NO2 concentrations are shown to still be at a similar level to those measured in 2000. Trends in NO2 concentrations have shown some slight improvement over the last 5 years. At some locations in Bristol city centre, annual mean concentrations exceed 60 ug/m3 and widespread locations of exceedance of the annual mean objective for NO2 exist. The city centre NO2 measurements all exceed the Air Quality Objective. Many other parts of Bristol, especially near busy roads and in the city centre, exceed national objectives and European limit values for NO2.

For more detailed information on air quality monitoring, please read the Annual Status Report (ASR) published by Bristol City Council.

For current air quality information visit our Open Data Portal.