What is the primary reason a close opposition might still yield poor views for observers in the Northern Hemisphere?

Answer

Mars might be very low in the southern sky due to orbital inclination.

If Mars is low in the sky, its light must travel through a longer, thicker, and more turbulent section of Earth's atmosphere, severely degrading the view regardless of proximity.

What is the primary reason a close opposition might still yield poor views for observers in the Northern Hemisphere?
Marsastronomyconditionsobservationplanet