diff --git a/lib/pages/analytics/modules/air_quality/widgets/aqi_type_dropdown.dart b/lib/pages/analytics/modules/air_quality/widgets/aqi_type_dropdown.dart
index ea85f075..196f02ce 100644
--- a/lib/pages/analytics/modules/air_quality/widgets/aqi_type_dropdown.dart
+++ b/lib/pages/analytics/modules/air_quality/widgets/aqi_type_dropdown.dart
@@ -3,16 +3,18 @@ import 'package:syncrow_web/utils/color_manager.dart';
 import 'package:syncrow_web/utils/extension/build_context_x.dart';
 
 enum AqiType {
-  aqi('AQI'),
-  pm25('PM2.5'),
-  pm10('PM10'),
-  hcho('HCHO'),
-  tvoc('TVOC'),
-  co2('CO2'),
-  c6h6('C6H6');
+  aqi('AQI', ''),
+  pm25('PM2.5', 'µg/m³'),
+  pm10('PM10', 'µg/m³'),
+  hcho('HCHO', 'mg/m³'),
+  tvoc('TVOC', 'µg/m³'),
+  co2('CO2', 'ppm'),
+  c6h6('C6H6', 'µg/m³');
+
+  const AqiType(this.value, this.unit);
 
   final String value;
-  const AqiType(this.value);
+  final String unit;
 }
 
 class AqiTypeDropdown extends StatefulWidget {