How Air Pollution Causes Mitochondria Damage

It is becoming increasingly clear that mitochondria may also be affected by air pollutants, such as gases, pesticides, or microparticles. Building on this, scientists are now exploring how pollution might interfere with mitochondrial function, and whether this could help explain pollution-related diseases.

Studies have shown that air pollution – particularly Particulate Matter (PM) – can directly damage mitochondria and as a result disrupt their function. In particular, fine particulate matter (PM2.5), referring to particulate matter with an aerodynamic diameter ≤ 2.5µm, can contain various toxic substances such as heavy metals, Polycyclic Aromatic Hydrocarbons (PAHs).

Mitochondria are essential to life because they are the primary source of cellular energy and are also the sensor sentinels of all living creatures.

They are responsible for converting nutrients into adenosine triphosphate (ATP), the energy unit that powers almost every biological function, including brain activity and muscle contraction. An estimated 3 × 10²⁵ ATP molecules are produced daily by the 1,000–2,500 mitochondria found in each human cell, which is roughly equal to an individual’s body weight. Since ATP cannot be stored, it must be produced continuously, so maintaining mitochondrial integrity is crucial for survival and good health.

It is noteworthy to mention that mitochondria are the only cellular components capable of self-replication, internal damage repair, and the elimination of malfunctioning copies. Cells can sustain energy balance even in the face of stress thanks to this self-renewal process.

They can be hampered by oxidative stress, poor diet, or long-term exposure to environmental contaminants, which lowers energy production and makes a person more susceptible to illness. The damage is offset by the ability to produce new mitochondria through mitochondrial biogenesis, and exercise is the only known physiological stimulus that activates this process.

Healthy lifestyle choices like consistent exercise, a healthy diet, and lowering oxidative stress can help restore mitochondrial balance and boost cellular resilience, despite environmental pollution that constantly contributes to impairing mitochondrial function.

Hence, maintaining mitochondrial health is essential for energy metabolism and serves as a major defense against the long-term negative health effects of pollution.