What does the color scale mean?

The color scale is the Air Quality Index (AQI) developed by the US EPA. You can learn more about it here. The AQI reflects health studies that show that your pollution exposure over an entire day matters most.  However, the AQI colors are used for both the Health and Instant views. This was chosen due to the familiarity with the AQI. The minute data shown in the Instant view does not have a health effect or recommendation associated with its AQI colors. This is because exposure to moderate pollution (yellow AQI) for a whole day is worse than being exposed for just one minute. If you want to know about how the pollution can be affecting your health, use the Health view.

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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?