> ## Documentation Index
> Fetch the complete documentation index at: https://moengage.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Why Are Android Impressions Dropping?

> Diagnose why Android push notification impressions are declining. Covers integration issues, segmentation criteria, SDK changes, and OS-level blocks.

## Problem

The Android impressions for campaigns are decreasing.

## Explanation

The following are possible causes for the decreasing Android impression:

* The app may not be sending the *notification received* events due to an integration issue.
* The segmentation criteria might differ for campaigns with lower impressions.
* The number of sent notifications could be lower.
* There may be changes in the App and SDK versions.
* There may be changes in the Device models.
* Users may have blocked notifications at the operating system level.
* Network issues may prevent users from connecting to Google Cloud Messaging (GCM).
* The notification's time to live (TLL) may expire before delivery.
* There may be a delay between when the app is uninstalled and when GCM marks the device as inactive.
* An external firewall might reject incoming packets due to security settings.