data/spatial_aggregation/o9i7t69l.py

def true_code():
    import pandas as pd
    df = pd.read_csv("raw_data/main_data.csv")
    df['Timestamp'] = pd.to_datetime(df['Timestamp'])
    data = df[(df['Timestamp'].dt.month >= 6) & (df['Timestamp'].dt.month <= 9)].groupby('state')['PM2.5'].mean().idxmin()
    print(data)

true_code()