diff --git a/include/payload.h b/include/payload.h
index 29d1f88e..889c164d 100644
--- a/include/payload.h
+++ b/include/payload.h
@@ -23,7 +23,8 @@
 #define LPP_HUMIDITY_CHANNEL 29
 #define LPP_BAROMETER_CHANNEL 30
 #define LPP_AIR_CHANNEL 31
-#define LPP_PARTMATTER_CHANNEL 32    // particular matter
+#define LPP_PARTMATTER10_CHANNEL 32    // particular matter for PM 10
+#define LPP_PARTMATTER25_CHANNEL 33    // particular matter for PM 2.5
 
 // MyDevices CayenneLPP 2.0 types for Packed Sensor Payload, not using channels,
 // but different FPorts