AttributeError: 'numpy.ndarray' object has no attribute 'set_aspect'

Question

When I write the code:

for i in iaq:

fig, ax = plt.subplots(8,5,figsize=(8,5))
df_g2[df_g2[\'aq_date\'] == i].plot(column=\'zone_id\', cmap=\'Greens\', ax=ax