The most unhealthy air quality level, as categorized by the Air Quality Index (AQI), is Hazardous. This represents the most severe conditions, posing significant health risks to everyone.
Understanding the Air Quality Index (AQI)
The Air Quality Index (AQI) is a tool used to communicate how clean or polluted the air is, and what associated health effects might be a concern. It ranges from 0 to 500, with higher values indicating a greater level of air pollution and increased health concern. Different AQI ranges are assigned specific levels of health concern and corresponding colors to make air quality information easy to understand.
Levels of Health Concern
Air quality conditions are categorized into several levels, each with distinct health implications:
- Unhealthy (Red): When the AQI falls within the range of 151 to 200, the air quality is considered unhealthy. At this level, some members of the general public, and particularly sensitive groups, may experience health effects.
- Very Unhealthy (Purple): An AQI between 201 and 300 signifies very unhealthy air quality. This means that everyone may begin to experience more serious health effects, and sensitive groups are at an even greater risk.
- Hazardous (Maroon): This is the highest and most severe level on the AQI, with values ranging from 301 to 500. When air quality reaches the hazardous level, it triggers health warnings of emergency conditions. Everyone is more likely to be affected by serious health effects, and it is crucial to take protective measures.
The table below summarizes these critical air quality levels:
| AQI Range | Air Quality Conditions | Symbolized by Color |
|---|---|---|
| 151 to 200 | Unhealthy | Red |
| 201 to 300 | Very Unhealthy | Purple |
| 301 to 500 | Hazardous | Maroon |
Why Hazardous Air Quality is Critical
Air quality designated as Hazardous means the concentration of pollutants in the air is extremely high, posing immediate and severe health threats. Exposure to such conditions can lead to exacerbated respiratory issues, cardiovascular problems, and other serious health complications for the entire population, not just sensitive individuals. During these times, it is generally advised to avoid all outdoor physical activity and remain indoors with filtered air if possible.
