diff --git a/notification_service/src/main/java/ch/hesso/pi/notification/config/NotificationProperties.java b/notification_service/src/main/java/ch/hesso/pi/notification/config/NotificationProperties.java
index ca17635..d3840b6 100644
--- a/notification_service/src/main/java/ch/hesso/pi/notification/config/NotificationProperties.java
+++ b/notification_service/src/main/java/ch/hesso/pi/notification/config/NotificationProperties.java
@@ -27,7 +27,8 @@ public class NotificationProperties {
         private String apiUrl = "http://localhost:8080";
         private long pollIntervalMs = 60_000;
         private Thresholds thresholds = new Thresholds();
-        private String alertFromLevel = "poor";
+        private String  alertFromLevel = "poor";
+        private boolean mockMode       = false;
 
         public String getApiUrl() { return apiUrl; }
         public void setApiUrl(String apiUrl) { this.apiUrl = apiUrl; }
@@ -40,6 +41,9 @@ public class NotificationProperties {
 
         public String getAlertFromLevel() { return alertFromLevel; }
         public void setAlertFromLevel(String alertFromLevel) { this.alertFromLevel = alertFromLevel; }
+
+        public boolean isMockMode() { return mockMode; }
+        public void setMockMode(boolean mockMode) { this.mockMode = mockMode; }
     }
 
     public static class Thresholds {
diff --git a/notification_service/src/main/java/ch/hesso/pi/notification/scheduler/AirQualityScheduler.java b/notification_service/src/main/java/ch/hesso/pi/notification/scheduler/AirQualityScheduler.java
index 8ba9b42..f0a23af 100644
--- a/notification_service/src/main/java/ch/hesso/pi/notification/scheduler/AirQualityScheduler.java
+++ b/notification_service/src/main/java/ch/hesso/pi/notification/scheduler/AirQualityScheduler.java
@@ -10,6 +10,7 @@ import org.slf4j.LoggerFactory;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
+import java.time.Instant;
 import java.util.List;
 
 @Component
@@ -17,9 +18,15 @@ public class AirQualityScheduler {
 
     private static final Logger log = LoggerFactory.getLogger(AirQualityScheduler.class);
 
-    private final AirQualityService       airQualityService;
-    private final TeamsNotificationService teamsService;
-    private final NotificationProperties   props;
+    private static final List<SensorReading> MOCK_READINGS = List.of(
+        new SensorReading("A1", "Salle A1", 2150, 23.5, 55, "closed", Instant.now()),
+        new SensorReading("A2", "Salle A2", 1520, 22.0, 48, "open",   Instant.now()),
+        new SensorReading("B1", "Salle B1",  780, 21.0, 42, "closed", Instant.now())
+    );
+
+    private final AirQualityService        airQualityService;
+    private final TeamsNotificationService  teamsService;
+    private final NotificationProperties    props;
 
     public AirQualityScheduler(AirQualityService airQualityService,
                                 TeamsNotificationService teamsService,
@@ -29,20 +36,16 @@ public class AirQualityScheduler {
         this.props             = props;
     }
 
-    /**
-     * Polls air quality data at the configured interval and sends a Teams alert
-     * for each room whose CO₂ level reaches or exceeds the configured threshold.
-     *
-     * The interval is read from the environment variable POLL_INTERVAL_MS
-     * (default: 60 000 ms). Spring's @Scheduled only supports fixed values at
-     * compile-time, so we use fixedDelayString with a SpEL expression instead.
-     */
-    @Scheduled(fixedDelayString = "${notification.air-quality.poll-interval-ms:60000}",
-               initialDelayString = "5000")
+    @Scheduled(fixedDelayString    = "${notification.air-quality.poll-interval-ms:60000}",
+               initialDelayString  = "5000")
     public void checkAirQuality() {
-        log.debug("Polling air quality data…");
+        boolean mockMode = props.getAirQuality().isMockMode();
+        log.debug("Polling air quality data… (mock={})", mockMode);
+
+        List<SensorReading> readings = mockMode
+            ? MOCK_READINGS
+            : airQualityService.fetchLatestReadings();
 
-        List<SensorReading> readings = airQualityService.fetchLatestReadings();
         if (readings.isEmpty()) {
             log.warn("No readings returned — skipping this cycle");
             return;
diff --git a/notification_service/src/main/resources/application.yml b/notification_service/src/main/resources/application.yml
index ce26747..eeccd93 100644
--- a/notification_service/src/main/resources/application.yml
+++ b/notification_service/src/main/resources/application.yml
@@ -4,7 +4,7 @@ spring:
 
 notification:
   teams:
-    webhook-url: ${TEAMS_WEBHOOK_URL:}
+    webhook-url: ${TEAMS_WEBHOOK_URL:https://defaulta372f724c0b24ea0abfb0eb8c6f84e.40.environment.api.powerplatform.com:443/powerautomate/automations/direct/workflows/e661f41b50314eeebaccc123a0fcc129/triggers/manual/paths/invoke?api-version=1&sp=%2Ftriggers%2Fmanual%2Frun&sv=1.0&sig=0L78wU0kY2jjnXUwehf6lkDnA61vQOD4SuTHcRsdOX8}
   air-quality:
     api-url: ${AIR_QUALITY_API_URL:http://localhost:8080}
     poll-interval-ms: ${POLL_INTERVAL_MS:60000}
@@ -15,3 +15,5 @@ notification:
       critical: 2000
     # Minimum level that triggers a notification (excellent / good / moderate / poor / critical)
     alert-from-level: poor
+    # Set to true to skip the API call and use hardcoded mock readings (for local testing)
+    mock-mode: ${MOCK_MODE:false}