diff --git a/mainloop.cpp b/mainloop.cpp
index c1b3fe3..5f2b33d 100644
--- a/mainloop.cpp
+++ b/mainloop.cpp
@@ -58,7 +58,24 @@
 
     for (auto& i : *sensors)
     {
-        auto value = std::make_tuple(std::move(i.second));
+        // Ignore inputs without a label.
+        std::string envKey = "LABEL_" + i.first.first + i.first.second;
+        std::string label;
+
+        auto env = getenv(envKey.c_str());
+
+        if (env)
+        {
+            label.assign(env);
+        }
+
+        if (label.empty())
+        {
+            continue;
+        }
+
+        auto value = std::make_tuple(std::move(i.second), std::move(label));
+
         state[std::move(i.first)] = std::move(value);
     }
 
diff --git a/mainloop.hpp b/mainloop.hpp
index d1fc9ca..c017ba9 100644
--- a/mainloop.hpp
+++ b/mainloop.hpp
@@ -46,7 +46,7 @@
         void shutdown() noexcept;
 
     private:
-        using mapped_type = std::tuple<SensorSet::mapped_type>;
+        using mapped_type = std::tuple<SensorSet::mapped_type, std::string>;
         using SensorState = std::map<SensorSet::key_type, mapped_type>;
 
         /** @brief sdbusplus bus client connection. */