ImmoNoise - Noise Pollution | Chrome Extension

ImmoNoise is a Google Chrome extension that displays road, rail, and overall noise pollution levels directly on ImmobilienScout24, Living in Berlin, and Urbanground property pages. Specifically designed for Berlin, it provides users with crucial environmental data before they even visit a property.

Key Features

• Hybrid Fetching Architecture: Uses a Cloudflare Worker for speed and caching, with a seamless client-side fallback to direct APIs if the proxy is unavailable.
• Deep Address Extraction: Leverages internal IS24 script data (IS24.expose.locationAddress) for high-precision lookups, including street and house number.
• Smart Address Handling: Correctly identifies and handles hidden addresses ("No address available" message) to avoid incorrect lookups.
• Multi-Source Noise Data: Displays Road Traffic, Tram/U-Bahn, and Sum of All Traffic Sources.
• Smart City Detection: Priority detection via internal script objects, with fallback to JSON-LD schema (optimized for Berlin).
• Proactive UI: Shows "Coming soon" for properties outside Berlin to manage expectations.
• Accurate Color Coding:
  • 🌲 Dark Green: bis 55 dB(A) (Quiet)
  • 🟢 Green: 55 - 59 dB(A)
  • 🟡 Yellow: 59 - 64 dB(A)
  • 🔴 Red: 64 - 69 dB(A)
  • 🟣 Purple: 69 - 74 dB(A) (Loud)
• Interactive Noise Map: View the noise data on a live map embedded directly in the badge, rendered locally with Leaflet.
• Supported Portals: ImmobilienScout24, Living in Berlin, Urbanground (Berlin listings).

• Edge Caching: Data is cached for 30 days at the edge, reducing total requests to berlin.de by ~90%.
• Premium Design: Modern glassmorphism UI with smooth animations and an animated wave logo.

Installation (Developer Mode)

1. Download/Clone this repository to your local machine.
2. Open Google Chrome and navigate to chrome://extensions/.
3. Enable Developer mode (toggle in the top right corner).
4. Click Load unpacked.
5. Select the ImmoNoise folder where the manifest.json is located.
6. Visit any ImmobilienScout24, Living in Berlin, or Urbanground listing in Berlin.

Architecture

ImmoNoise uses a Worker-first approach:

1. Primary: Fetch from api-immonoise.martinaberastegue.com (Cloudflare Worker).
2. Cache: Results are cached for 30 days to ensure sub-100ms response times.
3. Fallback: If the Worker is unreachable or blocked, the extension automatically performs the 4-step fetching process directly from the user's browser.

graph TD
    A[Detect Address: IS24 Script Data] --> B{Full Address?}
    B -- No --> C[Show: No address available]
    B -- Yes --> D{Try Cloudflare Worker}
    D -- "Success (Cached/New)" --> E[Update UI]
    D -- "Failure (Blocked/Down)" --> F[Direct Fetch: Berlin GDI]
    F --> G[Geosearch API]
    G --> H[WMS GetFeatureInfo x3]
    H --> E

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Technical Details

• Manifest V3: Compliant with the latest Chrome extension standards.
• Worker Proxy: Built with Cloudflare Workers to aggregate and normalize WMS data.
• Precision Extraction: Aggregates street, houseNumber, zip, and city from IS24 internal script tags using regex for sub-1ms parsing.
• APIs Used:
  • Berlin GDI Geosearch
  • Berlin GDI WMS (Umweltatlas 2022)
• City Detection: Primarily uses internal IS24 location data with application/ld+json fallback.

License

MIT License - feel free to use and modify for your own projects!