aqi guidelines

Spinning past the autumnal equinox into fall, the West looks back on a summer marred by wildfire smoke. Here in Colorado, the Aspens have dropped their golden leaves, snow encrusts the high peaks, and I’m struck by the beauty of my backyard, which spent the majority of June, July, and August muted by smoke that — thankfully — blew in from elsewhere.  Over the last six weeks, checking AirNow before training has been phased out...