diff --git a/README.md b/README.md
index 0f71bac..33ab6a8 100644
--- a/README.md
+++ b/README.md
@@ -17,3 +17,12 @@ Build the app
 ```shell
 flutter build <platform> --dart-define MAPBOX_ACCESS_TOKEN=...
 ```
+
+Copy the Firebase config from https://console.firebase.google.com/project/<project-id>/settings/general/ and use it the same way:
+
+```shell
+--dart-define FIREBASE_API_KEY=...
+--dart-define FIREBASE_APP_ID=....
+--dart-define FIREBASE_MESSAGING_SENDER_ID=...
+--dart-define FIREBASE_PROJECT_ID=...
+```
diff --git a/green_walking/lib/config.dart b/green_walking/lib/config.dart
index cda3ecc..f360c30 100644
--- a/green_walking/lib/config.dart
+++ b/green_walking/lib/config.dart
@@ -10,3 +10,10 @@ class CustomMapboxStyles {
   static const String outdoor = 'mapbox://styles/xennis/ckfbioyul1iln1ap0pm5hrcgy';
   static const String satellite = 'mapbox://styles/xennis/ckfc5mxh33tjg19qvk6m5f5hj';
 }
+
+// env
+const mapboxAccessToken = String.fromEnvironment("MAPBOX_ACCESS_TOKEN");
+const firebaseApiKey = String.fromEnvironment("FIREBASE_API_KEY");
+const firebaseAppId = String.fromEnvironment("FIREBASE_APP_ID");
+const firebaseMessagingSenderId = String.fromEnvironment("FIREBASE_MESSAGING_SENDER_ID");
+const firebaseProjectId = String.fromEnvironment("FIREBASE_PROJECT_ID");
diff --git a/green_walking/lib/firebase_options.dart b/green_walking/lib/firebase_options.dart
new file mode 100644
index 0000000..17786bd
--- /dev/null
+++ b/green_walking/lib/firebase_options.dart
@@ -0,0 +1,62 @@
+// File generated by FlutterFire CLI.
+// ignore_for_file: lines_longer_than_80_chars, avoid_classes_with_only_static_members
+import 'package:firebase_core/firebase_core.dart' show FirebaseOptions;
+import 'package:flutter/foundation.dart' show defaultTargetPlatform, kIsWeb, TargetPlatform;
+
+import 'config.dart';
+
+/// Default [FirebaseOptions] for use with your Firebase apps.
+///
+/// Example:
+/// ```dart
+/// import 'firebase_options.dart';
+/// // ...
+/// await Firebase.initializeApp(
+///   options: DefaultFirebaseOptions.currentPlatform,
+/// );
+/// ```
+class DefaultFirebaseOptions {
+  static FirebaseOptions get currentPlatform {
+    if (kIsWeb) {
+      throw UnsupportedError(
+        'DefaultFirebaseOptions have not been configured for web - '
+        'you can reconfigure this by running the FlutterFire CLI again.',
+      );
+    }
+    switch (defaultTargetPlatform) {
+      case TargetPlatform.android:
+        return android;
+      case TargetPlatform.iOS:
+        throw UnsupportedError(
+          'DefaultFirebaseOptions have not been configured for ios - '
+          'you can reconfigure this by running the FlutterFire CLI again.',
+        );
+      case TargetPlatform.macOS:
+        throw UnsupportedError(
+          'DefaultFirebaseOptions have not been configured for macos - '
+          'you can reconfigure this by running the FlutterFire CLI again.',
+        );
+      case TargetPlatform.windows:
+        throw UnsupportedError(
+          'DefaultFirebaseOptions have not been configured for windows - '
+          'you can reconfigure this by running the FlutterFire CLI again.',
+        );
+      case TargetPlatform.linux:
+        throw UnsupportedError(
+          'DefaultFirebaseOptions have not been configured for linux - '
+          'you can reconfigure this by running the FlutterFire CLI again.',
+        );
+      default:
+        throw UnsupportedError(
+          'DefaultFirebaseOptions are not supported for this platform.',
+        );
+    }
+  }
+
+  static const FirebaseOptions android = FirebaseOptions(
+    apiKey: firebaseApiKey,
+    appId: firebaseAppId,
+    messagingSenderId: firebaseMessagingSenderId,
+    projectId: firebaseProjectId,
+  );
+}
diff --git a/green_walking/lib/main.dart b/green_walking/lib/main.dart
index e6247cc..bcfc9aa 100644
--- a/green_walking/lib/main.dart
+++ b/green_walking/lib/main.dart
@@ -6,6 +6,7 @@ import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:mapbox_maps_flutter/mapbox_maps_flutter.dart';
 import 'package:provider/provider.dart';
 
+import 'config.dart';
 import 'firebase_options.dart';
 import 'provider/prefs_provider.dart';
 import 'routes.dart';
@@ -19,7 +20,7 @@ Future<void> main() async {
   // Pass all uncaught errors from the framework to Crashlytics.
   FlutterError.onError = FirebaseCrashlytics.instance.recordFlutterError;
 
-  MapboxOptions.setAccessToken(const String.fromEnvironment("MAPBOX_ACCESS_TOKEN"));
+  MapboxOptions.setAccessToken(mapboxAccessToken);
 
   runApp(const GreenWalkingApp());
 }