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Wildfire Smoke Health Index The following table provides an index to assist in assessing the health category based on visibility in your area. Recommended cautionary statements are listed for each category. To assess visibility: • Face away from the sun. Determine visibility range by looking for targets that are at known distances (miles). • The visible range is the point where even high-contrast objects disappear. • After determining visibility in miles, use the following Index to assess air quality. Visibility Range Health Category Cautionary Statements 10+ miles Good None 5 - 10 miles Moderate Usually sensitive people should consider reducing prolonged or heavy exertion. 3 - 5 miles Unhealthy for Sensitive Groups Sensitive people should reduce prolonged or heavy exertion. 2 - 3 miles Unhealthy Sensitive people should avoid prolonged or heavy exertion. Everyone else should reduce prolonged or heavy exertion. 1 - 2 miles Very Unhealthy Sensitive people should avoid all physical activity outdoors. Everyone else should avoid prolonged or heavy exertion. < 1 mile Hazardous Sensitive people should remain indoors and keep activity levels low. Everyone else should avoid all physical activity outdoors.