Blue Sky Feels A Little Different In Beijing

Air quality in Beijing has been improving steadily since July 26, says University of Rhode Island atmospheric chemist Kenneth Rahn. Rahn, who plots the daily air quality in Beijing, decodes "blue sky days" and other measures of air quality for Alex Chadwick. Unfortunately, it looks like the air is going to get worse right around the start of the Olympics, he says. Below, a chart plotting air quality and a graphic explaining what these numbers mean.

Air Quality Chart i i
Courtesy Kenneth Rahn
Air Quality Chart
Courtesy Kenneth Rahn
Air Chart i i

Rahn breaks down what different levels, above, mean in this chart. Courtesy Kenneth Rahn hide caption

itoggle caption Courtesy Kenneth Rahn
Air Chart

Rahn breaks down what different levels, above, mean in this chart.

Courtesy Kenneth Rahn

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