Why does your map look different from the map at purpleair.com?

Sensors on purpleair.com are not calibrated by default. There is a drop down menu to apply a limited number of calibration equations, however they are not specific to our region. The Agency sensor map calibrates all of the sensors to nearby agency monitors, which is a more accurate way to do calibration.

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1. I see a red circle surrounded by green circles. Why is that?
2. Why are the Health and Instant views different?
3. What does the color scale mean?
4. What can I use the Health view for?
5. What can I use the Instant view for?
6. Why does your map look different from the map at purpleair.com?
7. Can I put a sensor on your map?