diff --git a/android/app/build.gradle b/android/app/build.gradle
index 4fb7c06..2675914 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -130,4 +130,7 @@ dependencies {
     androidTestImplementation 'androidx.compose.ui:ui-test-junit4'
     debugImplementation 'androidx.compose.ui:ui-tooling'
     debugImplementation 'androidx.compose.ui:ui-test-manifest'
+
+    // Google Mobile Ads
+    implementation 'com.google.android.gms:play-services-ads:23.0.0'
 }
diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 1cd7fd5..5e5fe4e 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -23,6 +23,11 @@
         android:networkSecurityConfig="@xml/network_security_config"
         android:usesCleartextTraffic="false">
         
+        <!-- AdMob App ID -->
+        <meta-data
+            android:name="com.google.android.gms.ads.APPLICATION_ID"
+            android:value="ca-app-pub-3940256099942544~3347511713"/>
+
         <activity
             android:name=".MainActivity"
             android:exported="true"
diff --git a/android/app/src/main/kotlin/com/climaai/app/ads/AdManager.kt b/android/app/src/main/kotlin/com/climaai/app/ads/AdManager.kt
index 5f84932..149e872 100644
--- a/android/app/src/main/kotlin/com/climaai/app/ads/AdManager.kt
+++ b/android/app/src/main/kotlin/com/climaai/app/ads/AdManager.kt
@@ -13,17 +13,19 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
+import com.google.android.gms.ads.AdError
+import com.google.android.gms.ads.AdRequest
+import com.google.android.gms.ads.FullScreenContentCallback
+import com.google.android.gms.ads.LoadAdError
+import com.google.android.gms.ads.MobileAds
+import com.google.android.gms.ads.interstitial.InterstitialAd
+import com.google.android.gms.ads.interstitial.InterstitialAdLoadCallback
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 
 /**
  * Manages AdMob ads in the app.
- * 
- * Note: This is a mock implementation. In production:
- * 1. Add Google Mobile Ads SDK dependency
- * 2. Add AdMob App ID to AndroidManifest.xml
- * 3. Replace mock views with actual AdView implementations
  */
 object AdManager {
     
@@ -39,20 +41,17 @@ object AdManager {
     private val _adsEnabled = MutableStateFlow(true)
     val adsEnabled: StateFlow<Boolean> = _adsEnabled.asStateFlow()
     
+    private var interstitialAd: InterstitialAd? = null
+
     /**
      * Initialize the Mobile Ads SDK.
      * Call this in Application.onCreate()
      */
     fun initialize(context: Context) {
-        // In production:
-        // MobileAds.initialize(context) { initializationStatus ->
-        //     _isInitialized.value = true
-        //     Log.d(TAG, "AdMob initialized")
-        // }
-        
-        // Mock initialization
-        _isInitialized.value = true
-        Log.d(TAG, "AdManager initialized (mock)")
+        MobileAds.initialize(context) { initializationStatus ->
+            _isInitialized.value = true
+            Log.d(TAG, "AdMob initialized")
+        }
     }
     
     /**
@@ -67,30 +66,58 @@ object AdManager {
      * Load an interstitial ad.
      */
     fun loadInterstitial(context: Context, onLoaded: () -> Unit, onFailed: (String) -> Unit) {
-        // In production:
-        // InterstitialAd.load(context, INTERSTITIAL_AD_UNIT_ID, AdRequest.Builder().build(),
-        //     object : InterstitialAdLoadCallback() {
-        //         override fun onAdLoaded(ad: InterstitialAd) { ... }
-        //         override fun onAdFailedToLoad(error: LoadAdError) { ... }
-        //     }
-        // )
-        
-        // Mock: always succeed
-        onLoaded()
+        if (!_adsEnabled.value) {
+            onFailed("Ads are disabled")
+            return
+        }
+
+        val adRequest = AdRequest.Builder().build()
+        InterstitialAd.load(context, INTERSTITIAL_AD_UNIT_ID, adRequest,
+            object : InterstitialAdLoadCallback() {
+                override fun onAdLoaded(ad: InterstitialAd) {
+                    Log.d(TAG, "Ad was loaded.")
+                    interstitialAd = ad
+                    onLoaded()
+                }
+
+                override fun onAdFailedToLoad(error: LoadAdError) {
+                    Log.d(TAG, "Ad failed to load: ${error.message}")
+                    interstitialAd = null
+                    onFailed(error.message)
+                }
+            }
+        )
     }
     
     /**
      * Show the interstitial ad.
      */
     fun showInterstitial(activity: Activity, onDismissed: () -> Unit) {
-        // In production:
-        // interstitialAd?.show(activity)
-        // interstitialAd?.fullScreenContentCallback = object : FullScreenContentCallback() {
-        //     override fun onAdDismissedFullScreenContent() { onDismissed() }
-        // }
-        
-        // Mock: immediately dismiss
-        onDismissed()
+        val ad = interstitialAd
+        if (ad != null) {
+            // Clear reference to avoid reuse and allow loading next ad
+            interstitialAd = null
+
+            ad.fullScreenContentCallback = object : FullScreenContentCallback() {
+                override fun onAdDismissedFullScreenContent() {
+                    Log.d(TAG, "Ad was dismissed.")
+                    onDismissed()
+                }
+
+                override fun onAdFailedToShowFullScreenContent(adError: AdError) {
+                    Log.d(TAG, "Ad failed to show: ${adError.message}")
+                    onDismissed()
+                }
+
+                override fun onAdShowedFullScreenContent() {
+                    Log.d(TAG, "Ad showed fullscreen content.")
+                }
+            }
+            ad.show(activity)
+        } else {
+            Log.d(TAG, "The interstitial ad wasn't ready yet.")
+            onDismissed()
+        }
     }
 }