Create a custom “temperature” map with JavaScript

I want to create a map like this:

enter image description here

This example shows worldwide temperature levels. But to represent the level of pollution I need to use my own data, not related to temperature.

I tried the “Heatmap” layer, but it didn’t work for me, because it is mainly used to represent the population level:

enter image description here

How to create such a “temperature map” using Bing or Google maps api?
If there is no own solution using Google or Bing api, is there a library of things that can help me?

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