Why the vibrant sunsets?

We’ve been getting vibrant sunsets, but why? The explanations here are confusing to me, on two counts. The scientist quoted says it’s because “less air pollution and low humidity levels make for clearer skies and more vivid sunsets.”

But humidity hasn’t been low, and in past times, I know I’ve read that the one upside of having a certain amount of crud in the air is that it makes for fancier sunsets.