# Mean daily PM

![](/files/4vrjdFfxrG7v9ixGDYfr)

This chart shows the 24 hour mean (average) PM$$\_{2.5}$$ levels for each device location for the last complete 28 days, usually from the day before the present day. This provides a medium term comparison of air quality in different locations. The colour of the bar represents the risk category at the location according to AQI. WHO Air Quality Guideline thresholds are shown by the horizontal line.

By clicking on the ellipsis (...), the 3 dots in the top right hand corner of the chart a drop down menu appears. The chart can be printed, exported as a pdf, jpeg, or png. jpeg and png are most suitable formats for including in reports or social media, either will do the job.


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