An unhealthy air quality alert has been issued for parts of South Carolina and North Carolina, including Greenville and Spartanburg, due to elevated ozone and PM2.5 pollution levels. The EPA's AirNow Map indicates that the air quality is currently unsafe for sensitive groups, such as children, older adults, and individuals with respiratory conditions. The EPA advises these groups to avoid prolonged outdoor activities and encourages even healthy adults to reduce strenuous outdoor exertion. High levels of ozone and PM2.5 can lead to various health problems, including coughing, shortness of breath, and irritation of the airways, with long-term exposure potentially causing more serious respiratory and cardiovascular issues.