diff --git a/drivers/include/saul.h b/drivers/include/saul.h
index 55a50ea092..6bc40036b3 100644
--- a/drivers/include/saul.h
+++ b/drivers/include/saul.h
@@ -95,6 +95,7 @@ enum {
     SAUL_SENSE_COUNT    = 0x8d,     /**< sensor: pulse counter */
     SAUL_SENSE_DISTANCE = 0x8e,     /**< sensor: distance */
     SAUL_SENSE_CO2      = 0x8f,     /**< sensor: CO2 Gas */
+    SAUL_SENSE_TVOC     = 0x90,     /**< sensor: TVOC Gas */
     SAUL_CLASS_ANY      = 0xff      /**< any device - wildcard */
     /* extend this list as needed... */
 };
diff --git a/drivers/saul/saul_str.c b/drivers/saul/saul_str.c
index a8aae3da87..3f66582bd2 100644
--- a/drivers/saul/saul_str.c
+++ b/drivers/saul/saul_str.c
@@ -52,6 +52,7 @@ const char *saul_class_to_str(const uint8_t class_id)
         case SAUL_SENSE_COUNT:     return "SENSE_PULSE_COUNT";
         case SAUL_SENSE_DISTANCE:  return "SENSE_DISTANCE";
         case SAUL_SENSE_CO2:       return "SENSE_CO2";
+        case SAUL_SENSE_TVOC:      return "SENSE_TVOC";
         case SAUL_CLASS_ANY:       return "CLASS_ANY";
         default:                   return "CLASS_UNKNOWN";
     }
diff --git a/sys/include/phydat.h b/sys/include/phydat.h
index 0ab28226ff..b94aecb8a4 100644
--- a/sys/include/phydat.h
+++ b/sys/include/phydat.h
@@ -104,6 +104,7 @@ enum {
     UNIT_PERCENT,   /**< out of 100 */
     UNIT_PERMILL,   /**< out of 1000 */
     UNIT_PPM,       /**< part per million */
+    UNIT_PPB,       /**< part per billion */
     /* aggregate values */
     UNIT_TIME,      /**< the three dimensions contain sec, min, and hours */
     UNIT_DATE       /**< the 3 dimensions contain days, months and years */
diff --git a/sys/phydat/phydat_str.c b/sys/phydat/phydat_str.c
index 3f17c2940a..7d5755c35d 100644
--- a/sys/phydat/phydat_str.c
+++ b/sys/phydat/phydat_str.c
@@ -95,6 +95,7 @@ const char *phydat_unit_to_str(uint8_t unit)
         case UNIT_BAR:      return "Bar";
         case UNIT_PA:       return "Pa";
         case UNIT_PPM:      return "ppm";
+        case UNIT_PPB:      return "ppb";
         case UNIT_CD:       return "cd";
         case UNIT_PERCENT:  return "%";
         default:            return "";