Why do my phone and computer show two different readings on the map?

You may find that the PurpleAir map shows different values when viewing it in multiple places, such as on your phone and on your computer. This is due to having different options enabled on the two devices. Options such as “averaging period”, “data layer”, and “apply conversion” will display different readings. The map options can be accessed by clicking the white box shown by the red arrow in the screenshot below.

After clicking this white box. A drop down list of map settings is available for the user to change. The following screenshot outlines this box in red.

Map Settings

Each of these map settings can be modified by the user, which will display different data to the map. The explanation of each map setting can be found in our Map Start-up Guide.