Update README.md

README.md

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 # 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.
+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 with PM2.5 AQI labels.
 ![Dataset Overview](./6levels.png)
 ## Tasks
 - **Regression**: Predict continuous PM2.5 **AQI** values.