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Please complete the following steps to select the data and statistics you require:

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Measured Data and Statistics:
Select this option if you require raw monitoring data (ie as measured, µg/m3) or simple statistics such as daily min, max, mean or running means.

Exceedence Statistics:
Select this option if you require annual or monthly statistics, annual percentiles or exceedences of the National Air Quality Standards and Objectives.

Data Availability:
Select this option to find out what data are available for given pollutants and monitoring sites. Produces a table showing the start and end dates of monitoring and the percentage of data available in the archive.

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Pre-formatted files of automatic monitorng data as well as Excel files of metals and PAH data can be directly downloaded from the links shown.

In response to user feedback we've improved the data selector for Measured Data and Simple Statistics. All the selection menus are now included on one page and can be selected in any order. You can still use the old data selector if you prefer.


Comparing Data

Please read this article about Comparing data from different monitoring sites.
Comparing Data  
Please Note:

The database is now in mass units, conversion factors from volume units are available here:
Unit Conversion  

Details of the NO2 diffusion monitoring sites are available here.