Health: Breathing clean air can help prevent respiratory illnesses and allergic reactions. Polluted air can increase the risk of asthma, bronchitis and other respiratory diseases. Environment: Clean air is important for plant and animal life. Polluted air can negatively affect plant and animal life and disrupt ecosystem balance. Feeling good: When we breathe fresh air, we often feel more energetic and happier. When we breathe polluted air, we often feel tired and weak. Better sleep: When we breathe fresh air, our sleep quality can improve. When we breathe polluted air, our sleep quality may decrease and the risk of insomnia may increase. Better concentration: When we breathe fresh air, we can often concentrate better. When we breathe polluted air, we can often experience distraction and mental confusion.