Also the lack of differentiation between PM10 and PM2.5 numbers is very unhelpful. What&#x27;s actually being measured? Just saying PM isn&#x27;t useful. Plus, the scale only goes to 150 -- LOL, I&#x27;m in China, a scale that only goes 150 is useless.  Finally, for the activities, what&#x27;s the difference between &quot;take care&quot; and &quot;take it easy&quot;?