Datasets showing nitrogen dioxide levels (NO2) at various locations around Leeds. Please note From 17/02/17 this dataset will be archived and superseeded by the ratified air quality dataset /dataset/ratified-air-quality---nitrogen-dioxide which contains corroborated data quality checked by external auditors. Additional information The data is collected on an hourly basis Column A = Date of collection (YYMMDD) Column B = Time of collection Column C = Reading Column D = Validation (14 means the data has been validated but not that it has been ratified) NOTE: The data is not necessarily collected for all dates/times/stations Defra air quality data Information manage a further two stations in Leeds You can be sent information through their air quality bulletin and request up to hourly information from http://uk-air.defra.gov.uk/bulletin-subscription Archive CSV data can be downloaded from http://uk-air.defra.gov.uk/data/data_selector?=l&1=&s=&o=#mid