PM2.5 This Firefox add-on displays the current city PM2.5 values
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AIR value quality

PM2.5 Description

PM2.5 is a Firefox extension that will display the current city PM2.5 values in the status bar. It only works for Chinese cities. PM2.5 is an open source add-on designed to work with Mozilla Firefox 3.0 and later. It adds an entry in the status bar. Product's homepage

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