Under the sky box, the model becomes blurred

[miao-liu]

The same can be said, how to make the sky look clear

// renderer
const renderer = new THREE.WebGLRenderer({ canvas: el, antialias: true });
 renderer.shadowMap.enabled = true;
 renderer.setPixelRatio(window.devicePixelRatio);
 renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.outputEncoding = THREE.sRGBEncoding;
  renderer.toneMapping = THREE.ACESFilmicToneMapping;
  renderer.toneMappingExposure = 0.5;

// sky
 const effectController = {
        turbidity: 10,
        rayleigh: 3,
        mieCoefficient: 0.005,
        mieDirectionalG: 0.7,
        elevation: 70,
        azimuth: 180,
        exposure:   renderer.toneMappingExposure
      };

const sky = new Sky();
sky.scale.setScalar(450000);

const sun = new THREE.Vector3();

const uniforms = sky.material.uniforms;
uniforms['turbidity'].value = effectController.turbidity;
uniforms['mieCoefficient'].value = effectController.mieCoefficient;
uniforms['mieDirectionalG'].value = effectController.mieDirectionalG;

const phi = THREE.MathUtils.degToRad(90 - effectController.elevation);
const theta = THREE.MathUtils.degToRad(effectController.azimuth);

sun.setFromSphericalCoords(1, phi, theta);
uniforms['sunPosition'].value.copy(sun);


// AmbientLight
const light = new THREE.AmbientLight(0xffffff);

// scene
const scene = new THREE.Scene();
 scene.fog = new THREE.Fog(0xe4e8e9, 0 ,200);

render~

i hope

What am I doing wrong or what should I do?