YC116 aims to find out. Now hiring. Our mission: Making the world a better place by making the sky HN orange.

With occasional low hanging black clouds for when famous people die.

The Tubbs fire did a fine job of this, but it’s always dimmer than the luminosity of HN orange on a typical screen, so it depends on how you define “color”.

Not being exact, but at least 150+ AQI seems to generate a significant impact on sunlight coming through creating that "smoky"/"faded" look. I can't comment on how to get the orange exactly as I think it also requires specific particulate matter to get that.

Not particulate matter, but photochemical smog, so nitrogen and sulfur oxides, volatile organic compounds and of course ozone.

Add sodium lamps for lighting and you get a rich, orange hue.

what a funny/scary thought :)