# Where does one access VOC data (BME688)? **URL:** \ **Category:** Sensors\ **Created:** [March 3, 2023, 2:10am UTC](https://community.purpleair.com/t/where-does-one-access-voc-data-bme688/3804 "2023-03-03T02:10:59Z")\ **Posts on this page:** 1\ **Showing post:** 12
**Author:** ![Nick\_PurpleAir](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/nick_purpleair/32/3055_2.png) [@Nick\_PurpleAir](https://community.purpleair.com/u/Nick_PurpleAir)\ **Post date:** [October 9, 2023, 8:45pm UTC](https://community.purpleair.com/t/where-does-one-access-voc-data-bme688/3804/12 "2023-10-09T20:45:09Z")
To see the VOC data we supply simply select the sensor you were looking to view and select the data layer you wish to view. > [@Environmental Data Layers](https://community.purpleair.com/t/environmental-data-layers/155): > > The “Data Layer“ field determines which indices, scales, or metadata to display on the Map Markers, graphs, and the map legend. The default field selection is “US EPA PM2.5 AQI“. Environmental Layers This partition of data layers is a section of miscellaneous secondary and derivative data that describe the environment in ways other than mere particulate. Data for this section are supplied by auxiliary units within the PurpleAir sensors. Choose a data layer from the following section to presen… Our “Environmental Data Layers” guide will show you information about how it can be selected if you do not see it. > [@PurpleAir Map Guide](https://community.purpleair.com/t/purpleair-map-guide/90#data-layer-5): > > This guide serves as a starting point for using the [PurpleAir Map.](https://map.purpleair.com/) In it, you’ll find information regarding using and interpreting the map. Map Marker Every PurpleAir sensor on the PurpleAir map will appear as a colored dot. We call these map markers. Every map marker contains a numerical value that reflects whichever data layer you have selected. Clicking or tapping on a map marker will open a popup window with details about the selected sensor. The color of these numbers can be black or w… Our “PurpleAir Map Guide” can also be referenced to show how to access the data layers on our map. --- _[View the full topic](https://community.purpleair.com/t/where-does-one-access-voc-data-bme688/3804)._