data/specific_patterns/xyumoq27.py

def true_code():
    import pandas as pd
    df = pd.read_csv("raw_data/main_data.csv")
    df = df[df["city"] == "Mumbai"]
    df['Timestamp'] = pd.to_datetime(df['Timestamp'])
    df['Year'] = df['Timestamp'].dt.year
    df = df[df["Year"] >= 2019]
    data = df.groupby('Timestamp')['PM2.5'].max().idxmax().date()
    print(data)

true_code()