What three important things happen to the air we inhale to keep lungs healthy?

When we inhale, the air is first warmed to body temperature, which helps prevent irritation and damage to the lung tissues. Next, it is humidified, adding moisture to the air to protect the delicate surfaces within the lungs. Finally, the air is filtered through the nasal passages and respiratory tract, where mucus and tiny hair-like structures called cilia trap and remove dust, pathogens, and other particles, ensuring cleaner air reaches the lungs.