Diffusion Tubes Data

Nitrogen dioxide (NO2) diffusion tube data for monitoring locations within York - both inside and outside Air Quality Management Areas (AQMA), from 2005 onwards. Data is updated on annual basis in June. Monthly values are raw data (__not bias-corrected__) and presented in ppb (parts per billion). __Bias-corrected annual averages__ for each diffusion tube are presented in both ppb and ug/m3 (micrograms per cubic metre) and are only calculated where data capture is 75% or greater across the 12 month monitoring period. For more air quality related data please visit the following datasets: • [__Air Quality Management Areas (AQMAs) in York__](https://data.yorkopendata.org/dataset/local-air-quality-management-zones) • [__Air Quality Monitoring Stations Locations in York__](https://data.yorkopendata.org/dataset/local-air-quality-monitoring-stations) • [__York Air Quality Monitoring Stations Data__](https://data.yorkopendata.org/dataset/air-quality-monitoring-stations-data) • [__Diffusion Tubes (NO2) Locations in York__](https://data.yorkopendata.org/dataset/diffusion-tubes-locations)