Stale air in a parked car can cause a variety of issues, primarily due to the lack of fresh air circulation and the accumulation of pollutants within the enclosed space. Some potential consequences of stale air in a parked car include:

Reduced Oxygen Levels: Stale air lacks the oxygen content needed for breathing. Prolonged exposure to low oxygen levels can lead to discomfort, dizziness, fatigue, and in extreme cases, even fainting.

Increased Carbon Dioxide (CO2) Levels: When people breathe, they exhale carbon dioxide. In an enclosed space like a parked car, with limited fresh air intake, the concentration of CO2 can increase over time. High CO2 levels can lead to headaches, drowsiness, shortness of breath, and impaired cognitive function.

Unpleasant Odors: Stale air can lead to a buildup of odors from various sources, such as food, sweat, and other pollutants. This can result in an unpleasant and uncomfortable environment.

Increased Humidity: Without proper ventilation, humidity levels can rise inside a parked car. This can contribute to mold growth, fogged windows, and discomfort.

Potential for Allergens and Pollutants: Stale air can trap allergens, dust, and other particles, exacerbating allergies and respiratory conditions for those sensitive to such substances.

Interior Damage: Over time, prolonged exposure to stagnant air can contribute to interior materials deteriorating faster, such as upholstery, plastics, and fabrics.

Temperature Fluctuations: Stale air can contribute to temperature extremes inside the car. On hot days, the interior temperature can rise significantly, potentially leading to discomfort and health risks.

To avoid these issues, it’s important to ensure proper ventilation and fresh air circulation whenever you’re parked in a stationary car. If you need to leave a car parked for an extended period, consider cracking a window open slightly or using the Solar Car ventilation system to allow for air exchange. Additionally, avoid leaving pets, children, or anyone else vulnerable in a parked car without proper ventilation, as it can quickly become dangerous.