Air is a basic need of man. Man needs to breathe fresh air to continue living. We often take this fact for granted. Maybe because breathing is natural to us. We do not have to think about it. Our bodily functions make sure that our lungs breathe in the air into our system and supplies us with the oxygen that we need. We also cannot see air but it is all around us. However, unbeknownst to us, the air that we breathe is contaminated by harmful chemicals and particles that have been released into our environment. This makes the air that we breathe dirty and polluted. This is not healthy for our body. But we do not notice this because as we said, we cannot see air. But if we have the means to check the quality of the air around us, we will find out the level of pollution in the air. Again, we take this fact for granted because we can still breathe in the air easily and we continue to live. But what we do not realize is that it is taking its toll on our bodies. It affects our respiratory system since it is the one responsible for breathing and filtering the air that enters our bodies. People develop respiratory diseases such as asthma, bronchitis, chronic obstructive pulmonary disease, or cancer of the lungs. Polluted air also causes stress to our cardiovascular system since our heart works harder to supply our body with the oxygen and blood that it needs. Even those who are deemed healthy can also experience momentary difficulty in breathing, shortness of breath, coughing, or irritation to the eyes, nose, and throat when exposed to polluted air. That is why we should do our best to help keep our air cleaner for a healthier environment for all of us.