# Not on map versus gray on map **URL:** \ **Category:** Sensors\ **Created:** [September 5, 2024, 3:23pm UTC](https://community.purpleair.com/t/not-on-map-versus-gray-on-map/10171 "2024-09-05T15:23:12Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![Kieran](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/kieran/32/6220_2.png) [@Kieran](https://community.purpleair.com/u/Kieran)\ **Post date:** [September 5, 2024, 7:09pm UTC](https://community.purpleair.com/t/not-on-map-versus-gray-on-map/10171/2 "2024-09-05T19:09:46Z")
Hi @ckastely Sensors never technically disappear from the map. They _will_ go gray, as you have noted, which happens because a sensor has gone offline, or if all channels have become [downgraded.](https://community.purpleair.com/t/q-what-does-downgraded-mean-on-the-graph/821) However, there is a map setting that affects the visibility of gray dots. By default it is set to 7 days. Which means that if a sensor has been gray for more than 7 days, you wont see it on the map. More information is available here: [Does PurpleAir Remove Sensors From The Map?](https://community.purpleair.com/t/does-purpleair-remove-sensors-from-the-map/6822). Please let me know if you have any questions. --- _[View the full topic](https://community.purpleair.com/t/not-on-map-versus-gray-on-map/10171)._