Waiting to Exhale

The Minnesota Pollution Control Agency sees blue skies ahead. Or is that hot air?

While the AQI handily offers the public a color-coded way to gauge pollution levels, hour by hour, the health consequences, Ziebold argues, don't follow such a clear threshold. "Because of the enormous number of people involved," she says, "small risks equal a significant risk for the population."

Or as Corrigan wrote at the end of her cheery op-ed, "Maybe we can't see the difference, but the eagles can."

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