Geolocation: Weather application

Fetch weather data from an API using the user's geolocation data.
addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request));
});

async function handleRequest(request) {
  let endpoint = 'https://api.waqi.info/feed/geo:';
  const token = ''; //Use a token from https://aqicn.org/api/
  let html_style = `body{padding:6em; font-family: sans-serif;} h1{color:#f6821f}`;

  let html_content = '<h1>Weather 🌦</h1>';

  latitude = request.cf.latitude;
  longitude = request.cf.longitude;
  endpoint += `${latitude};${longitude}/?token=${token}`;
  const init = {
    headers: {
      'content-type': 'application/json;charset=UTF-8',
    },
  };

  const response = await fetch(endpoint, init);
  const content = await response.json();

  html_content += `<p>This is a demo using Workers geolocation data. </p>`;
  html_content += `You are located at: ${latitude},${longitude}.</p>`;
  html_content += `<p>Based off sensor data from <a href="${content.data.city.url}">${content.data.city.name}</a>:</p>`;
  html_content += `<p>The AQI level is: ${content.data.aqi}.</p>`;
  html_content += `<p>The N02 level is: ${content.data.iaqi.no2.v}.</p>`;
  html_content += `<p>The O3 level is: ${content.data.iaqi.o3.v}.</p>`;
  html_content += `<p>The temperature is: ${content.data.iaqi.t.v}°C.</p>`;

  let html = `
<!DOCTYPE html>
<head>
  <title>Geolocation: Weather</title>
</head>
<body>
  <style>${html_style}</style>
  <div id="container">
  ${html_content}
  </div>
</body>`;

  return new Response(html, {
    headers: {
      'content-type': 'text/html;charset=UTF-8',
    },
  });
}