data/questions/2/code.py

def true_code():
    import pandas as pd
    
    df = pd.read_csv('data/raw_data/Data.csv', sep=",")
    
    data = df[df['PM2.5'] > 300]
    ans = data.groupby(['state', 'station']).value_counts().idxmax()[0]
    print(ans)

true_code()