Air Quality Index (As Per US EPA Standard) Status Good Moderate Unhealthy For Sensitive People Unhealthy VeryUnhealthy Hazardous Index 1 2 3 4 5 6 Air Quality Index (As Per UK Defra Index) Index 1 2 3 4 5 6 7 8 9 10 Band Low Low Low Moderate Moderate Moderate High High High Very High
