The left lung is slightly smaller than the right lung.
This is because the left lung needs to accommodate the heart, which sits on the left side of the chest cavity.
The right lung has three lobes, while the left lung has only two. This difference in lobes contributes to the size difference between the two lungs.
While the left lung is smaller, it is not significantly smaller than the right lung. Both lungs play an essential role in oxygenating the blood and removing carbon dioxide.