Update README.md

README.md

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----
-license: cc-by-4.0
----
+---
+pretty_name: PM25Vision
+tags:
+  - computer-vision
+  - pm2.5
+  - regression
+  - classification
+  - air-quality
+  - AQI
+task_categories:
+  - image-classification
+  - other
+license: cc-by-4.0
+language:
+  - en
+size_categories:
+  - 10K<n<100K
+---
+
+
+# PM25Vision
+
+## Dataset Summary
+PM25Vision (PM25V) is a large-scale dataset for estimating air quality (PM2.5) from street-level imagery. It pairs **Mapillary** photos with **World Air Quality Index (WAQI)** PM2.5 records, covering 2014–2025, 3,261 monitoring stations, and 11,114 cleaned and balanced images.
+
+## Tasks
+- **Regression**: Predict continuous PM2.5 values.  
+- **Classification**: Predict discrete AQI levels.
+
+## Baseline Results
+### Regression
+| Model           | R²   | MAE  | RMSE | Acc  | F1   |
+|-----------------|------|------|------|------|------|
+| EfficientNet-B0 | 0.55 | 36.6 | 54.6 | 0.46 | 0.45 |
+| ResNet50        | 0.50 | 38.6 | 57.5 | 0.44 | 0.35 |
+| ViT-B/16        | 0.23 | 50.3 | 71.7 | 0.35 | 0.30 |
+
+### Classification
+| Model           | Acc  | F1   | Precision | Recall |
+|-----------------|------|------|-----------|--------|
+| ResNet50        | 0.44 | 0.38 | 0.48      | 0.37   |
+| ViT-B/16        | 0.40 | 0.37 | 0.41      | 0.36   |
+| EfficientNet-B0 | 0.40 | 0.34 | 0.42      | 0.33   |
+
+## Dataset Structure
+
+The dataset is organized into two main splits: **train** and **test**, each containing:
+
+- **`images/`**: all image files used in the dataset.  
+- **`samples_by_bin/`**: a small set of 30 example images per AQI bin (for quick visual inspection).  
+- **`metadata.csv`**: a CSV file describing metadata (including pm2.5 labels) for each image.  
+
+### Metadata Fields
+
+Each row in `metadata.csv` contains:
+
+| Field          | Type    | Description                                                                          |
+|----------------|---------|--------------------------------------------------------------------------------------|
+| **`image_id`** | int64   | Unique image identifier (from Mapillary).                                            |
+| `station_id`   | int64   | WAQI monitoring station ID.                                                          |
+| `captured_at`  | object  | Date when the image was captured (YYYY-MM-DD).                                       |
+| `camera_angle` | float64 | Camera orientation (if available).                                                   |
+| `longitude`    | float64 | Longitude of the station.                                                            |
+| `latitude`     | float64 | Latitude of the station.                                                             |
+| `quality_score`| float64 | Image quality score from Mapillary (if available).                                   |
+| `downloaded_at`| object  | Timestamp when the sample was downloaded.                                            |
+| **`pm25`**     | float64 | Average PM2.5 value of the day that the image was captured(the label, in AQI value). |
+| `filename`     | object  | Image filename, located in the `images/` directory.                                  |
+| `quality`      | object  | ResNet18 classified label for image quality (e.g., `good` or `bad`).                 |
+| `pm25_bin`     | object  | Discrete AQI level label (e.g., `0–50`, `51–100`, etc.).                             |
+
+### Splits
+
+- **Train**: 80% of samples, balanced across AQI bins.  
+- **Test**: 20% of samples, balanced across AQI bins.  
+
+
+## Limitations
+- WAQI temporal resolution is **daily**, may miss intra-day variation.  
+- Spatial accuracy limited to 5 km around stations.  
+- Rare extreme AQI classes remain underrepresented.
+
+## Access
+- Arxiv: ...
+- Online demo: [pm25vision.com](http://www.pm25vision.com)
+
+## Citation
+```bibtex
+@misc{pm25vision2025,
+  title        = {PM25Vision: Street-level imagery with PM2.5 annotations},
+  author       = {Han, Yang},
+  year         = {2025},
+  publisher    = {Hugging Face Datasets},
+  url          = {https://huggingface.co/datasets/DeadCardassian/PM25Vision}
+}
+```