Also the lack of differentiation between PM10 and PM2.5 numbers is very unhelpful. What's actually being measured? Just saying PM isn't useful. Plus, the scale

Also the lack of differentiation between PM10 and PM2.5 numbers is very unhelpful. What's actually being measured? Just saying PM isn't useful. Plus, the scale only goes to 150 -- LOL, I'm in China, a scale that only goes 150 is useless. Finally, for the activities, what's the difference between "take care" and "take it easy"?