Why air quality can still be bad even if the sky doesn’t look smoky

Why air quality can still be bad even if the sky doesn’t look smoky
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By Kasha Patel, CNN (CNN) — Wildfires are expected to bring unhealthy air to more than 120 million people this weekend, but the smoke and its toxic particles may not always be clearly visible. Some skylines are shrouded in obvious abnormal orange tinges with faint burnt odors. Other horizons ma...