These graphing tools are designed to allow flexible graphical analysis of the database. You can either plot measurements from up to six pollutants or weather parameters at one monitoring site, or compare measurements of one species at up to six different sites. You can select any period from one day to one year.

Please be patient; requests for long time periods may take a long time to fetch, especially during busy periods. Note that most monitoring sites have not been in operation for the whole period available.