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README.md

@@ -56,26 +56,16 @@ Additional files:
 
 ## Usage
 
-### Via `datasets` library
-
-```python
-from datasets import load_dataset
-
-# Load training split (2021–2023)
-ds = load_dataset("xuxing123/AirQualityBench", "train", streaming=True)
-for row in ds.take(5):
-    print(row["values"].shape)   # (3720, 6)
-    print(row["masks"].shape)    # (3720, 6)
-```
-
-### Direct HDF5 access (recommended for training)
+This dataset uses the HDF5 format with multiple internal arrays of different shapes, which is incompatible with the `datasets` library's HDF5 loader. Use `h5py` to read the files directly:
 
 ```python
 import h5py
 
 with h5py.File("aq_compact_2021.h5", "r") as f:
-    values = f["values"][:]   # (8760, 3720, 6)
-    masks = f["masks"][:]     # (8760, 3720, 6)
+    values = f["values"][:]       # (T, 3720, 6) float32
+    masks = f["masks"][:]         # (T, 3720, 6) bool
+    params = f["params"][:]       # (6,) pollutant names
+    station_ids = f["station_ids"][:]  # (3720,) station IDs
 ```
 
 ## Benchmark Code