Option 1, which ranges from 301-500, is considered to be hazardous on the Air Pollutant Index. This indicates that the air quality is very poor and poses a severe risk to human health. The air is filled with high levels of pollutants that can cause various health problems, especially for individuals with respiratory issues or weakened immune systems. It is important to take precautions when the Air Pollutant Index reaches this range, such as wearing masks or avoiding outdoor activities. This level reflects a critical situation where immediate action is required to reduce emissions and improve air quality.