A number of tools are available to help you gauge air quality in your area. But one tool is right under your nose – well actually right above it. How far you can see on a given day can be a good indicator of air quality. The 5-3-1 visibility index can help you estimate smoke levels and decide what precautions to take. This exercise will give you a good excuse to step outside – on a clear day. First, determine your visual range by scoping out distant targets or familiar landmarks that you know are a given distance away. If you can see 15 miles away the air quality is generally good. In the 5- to 15-mile range air quality is moderate and probably healthy except for sensitive groups such as those with respiratory conditions, particularly the closer to the 5-mile marker you get. Here’s where the 5-3-1 index kicks in: Under 5 miles Air quality is unhealthy for young children, adults over 65, pregnant women and people with heart and/or lung disease, asthm...