Air Quality Index (AQI) is a useful tool for understanding the level of pollution in the air. It measures pollutants like PM2.5, ozone, and carbon monoxide. While the AQI provides a general idea of air quality, focusing on PM2.5 levels can give you a better sense of the potential health risks. You can check local air quality through apps or websites like AirNow.gov. If the AQI is high, it’s best to limit outdoor activities and take precautions to protect your health.