Add fog to a map | Mapbox GL JS

This example uses setFog to add a fog effect to a map. It also transitions between night and day to change the mood of the environment.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Add fog to a map</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.3.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.3.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = '<your access token here>';
(async () => {
const map = new mapboxgl.Map({
container: 'map',
zoom: 13,
center: [6.6301, 45.35625],
pitch: 80,
bearing: 160,
interactive: false,
style: 'mapbox://styles/mapbox/satellite-streets-v11'
});
 
await map.once('load');
// Add fog
map.setFog({
'range': [-1, 1.5],
'color': 'white',
'horizon-blend': 0.1
});
 
// Add some 3d terrain
map.addSource('mapbox-dem', {
'type': 'raster-dem',
'url': 'mapbox://mapbox.terrain-rgb',
'tileSize': 512,
'maxzoom': 14
});
map.setTerrain({
'source': 'mapbox-dem',
'exaggeration': 1.5
});
 
// Add two different day and night sky layers so that we may switch between
// them during animation. We add a sky opacity transition to slightly animate
// the opacity updates.
map.addLayer({
'id': 'sky-day',
'type': 'sky',
'paint': {
'sky-type': 'gradient',
'sky-opacity-transition': { 'duration': 500 }
}
});
map.addLayer({
'id': 'sky-night',
'type': 'sky',
'paint': {
'sky-type': 'atmosphere',
'sky-atmosphere-sun': [90, 0],
'sky-atmosphere-halo-color': 'rgba(255, 255, 255, 0.5)',
'sky-atmosphere-color': 'rgba(255, 255, 255, 0.2)',
'sky-opacity': 0,
'sky-opacity-transition': { 'duration': 500 }
}
});
 
// Run a timing loop to switch between day and night
await map.once('idle');
let lastTime = 0.0;
let animationTime = 0.0;
let cycleTime = 0.0;
let day = true;
 
const initialBearing = map.getBearing();
 
function frame(time) {
const elapsedTime = (time - lastTime) / 1000.0;
 
animationTime += elapsedTime;
cycleTime += elapsedTime;
 
if (cycleTime > 10.0) {
if (day) {
map.setPaintProperty('sky-day', 'sky-opacity', 1);
map.setPaintProperty('sky-night', 'sky-opacity', 0);
map.setFog({ 'color': 'white' });
} else {
map.setPaintProperty('sky-day', 'sky-opacity', 0);
map.setPaintProperty('sky-night', 'sky-opacity', 1);
map.setFog({ 'color': 'rgba(66, 88, 106, 1.0)' });
}
 
day = !day;
cycleTime = 0.0;
}
 
const rotation = initialBearing + animationTime * 2.0;
map.setBearing(rotation % 360);
 
lastTime = time;
 
window.requestAnimationFrame(frame);
}
 
window.requestAnimationFrame(frame);
})();
</script>
 
</body>
</html>