A pollutant can affect the health of humans, as well as the health of plants and animals. Pollutants can also affect non-living materials such as paints, metals, and fabrics. The video also talked about “The Carbon Cycle” which is a complex series of processes through which all of the carbon atoms in existence rotate. The same carbon atoms in your body today have been used in countless other molecules since time began. The wood burned just a few decades ago could have produced carbon dioxide which through photosynthesis became part of a plant. Secondary pollutants are generally more problematic than that of primary pollutants, because mitigation of secondary pollutants requires the identification of the precursor compounds.. The video also talks about using an “AQI” which is an index for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. To make it easier to understand, the AQI is divided into six categories. The six levels of health concern and what they mean are: “Good" AQI is 0 - 50. Air quality is considered satisfactory, and air pollution poses little or no risk, "Moderate" AQI is 51 - 100. Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people. For example, people who are unusually sensitive to ozone may experience respiratory symptoms; “Unhealthy for Sensitive Groups" AQI is 101 - 150. Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air. "Unhealthy" AQI is 151 - 200. Everyone may begin to experience some adverse health effects, and members of the