Created RangeOfAqi model.

lib/pages/analytics/models/range_of_aqi.dart

@@ -0,0 +1,18 @@
+import 'package:equatable/equatable.dart';
+
+class RangeOfAqi extends Equatable {
+  final double min;
+  final double avg;
+  final double max;
+  final DateTime date;
+
+  const RangeOfAqi({
+    required this.min,
+    required this.avg,
+    required this.max,
+    required this.date,
+  });
+
+  @override
+  List<Object?> get props => [min, avg, max, date];
+}