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HTML

              
                <div id="bg">
  <div id="meter">
    <h1 id="current-aqi">---</h1>
    <p>
      <!--PM (Particle Matter) SVG-->
      <svg height="15px" viewBox="0 0 315 359" fill="none" xmlns="http://www.w3.org/2000/svg">
        <g id="PM">
          <circle id="Ellipse 1" cx="158" cy="27" r="27" />
          <circle id="Ellipse 2" cx="222" cy="68" r="27" />
          <circle id="Ellipse 3" cx="288" cy="109" r="27" />
          <circle id="Ellipse 4" cx="92" cy="67" r="27" />
          <circle id="Ellipse 5" cx="27" cy="109" r="27" />
          <circle id="Ellipse 6" cx="92.5" cy="141.5" r="26.5" />
          <circle id="Ellipse 7" cx="157" cy="101" r="27" />
          <circle id="Ellipse 8" cx="157.5" cy="174.5" r="26.5" />
          <circle id="Ellipse 9" cx="223" cy="142" r="26" />
          <circle id="Ellipse 10" cx="27" cy="178" r="21" />
          <circle id="Ellipse 11" cx="92" cy="210" r="21" />
          <circle id="Ellipse 12" cx="157" cy="243" r="21" />
          <circle id="Ellipse 13" cx="223" cy="210" r="21" />
          <circle id="Ellipse 14" cx="288" cy="178" r="21" />
          <circle id="Ellipse 15" cx="288" cy="236" r="16" />
          <circle id="Ellipse 16" cx="223" cy="268" r="16" />
          <circle id="Ellipse 17" cx="157" cy="301" r="16" />
          <circle id="Ellipse 18" cx="92" cy="268" r="16" />
          <circle id="Ellipse 19" cx="27" cy="236" r="16" />
          <circle id="Ellipse 20" cx="27.5" cy="282.5" r="10.5" />
          <circle id="Ellipse 21" cx="92.5" cy="315.5" r="10.5" />
          <circle id="Ellipse 22" cx="157.5" cy="348.5" r="10.5" />
          <circle id="Ellipse 23" cx="222.5" cy="315.5" r="10.5" />
          <circle id="Ellipse 24" cx="288.5" cy="282.5" r="10.5" />
        </g>
      </svg> AQI</p>
    <div id="indicator"></div>
  </div>
</div>
              
            
!

CSS

              
                :root {
  --primary-bg:#070807;
  --primary-color:whitesmoke;
  --meter-bg-colors:conic-gradient(
    from 0deg,
    rgba(0, 222, 114, 1),
    rgba(255, 226, 28, 1),
    rgba(255, 141, 6, 1),
    rgba(251, 42, 63, 1),
    rgba(178, 1, 238, 1),
    rgba(109, 9, 25, 1)
  );
}
/*Custom Font Import*/
@font-face {
  font-family: "clockDigital";
  src: url("https://assets.codepen.io/1179484/digital-7.woff2") format("woff2"),
    url("https://assets.codepen.io/1179484/digital-7.woff") format("woff");
}
/*CSS RESET*/
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "clockDigital";
}
/*Background properties*/
#bg {
  height: 100vh;
  background-color: var(--primary-bg);
  display: grid;
  place-items: center;
}
/*U.S.AQI meter using (EPA)category colors*/
#meter {
  position: relative;
  height: 200px;
  aspect-ratio: 1/1;
  border-radius: 100%;
  background:var(--meter-bg-colors);
  display: grid;
  place-items: center;
}
/*Inner body of meter*/
#meter:before {
  position: absolute;
  content: " ";
  padding: 90px;
  padding: 90px;
  border-radius: 100%;
  background: var(--primary-bg);
}
/*
the container for the indicator/dot to position it properly
and add a slight transition for the calculation formula in JS  
*/
#indicator {
  position: absolute;
  height: 205px;
  aspect-ratio: 1/1;
  transition:.2s;
  display: flex;
  justify-content: center;
  rotate: 5deg;
  /*animation:spin 5s linear alternate infinite;*/
}
/*The dot on the meter to indicate meters AQI level*/
#indicator:before {
  position: absolute;
  content: " ";
  padding: 5px;
  background: var(--primary-color);
  top: 0;
  border-radius: 100%;
  border: 3px solid var(--primary-bg);
}
/*AQI number*/
#current-aqi {
  position: absolute;
  letter-spacing: 1px;
  font-size: 70px;
  color: var(--primary-color);
  text-align: center;
  line-height: 20px;
}
/*SVG and AQI text*/
p {
  font-size: 20px;
  color: #999;
  position: absolute;
  top: 130px;
  display: flex;
  align-items: center;
  gap: 5px;
}
/*Particle matter SVG */
#PM {
  fill: #999;
}
/* for testing roation on the #indicator*/
@keyframes spin {
  from {
    rotate:5deg;
  }
  to {
    rotate:355deg;
  }
}
/*If user system = lightmode*/
@media (prefers-color-scheme: light) {
  /*use these settings instead*/
  :root {
    --primary-bg: #dbdbdb;
    --primary-color: rgb(61, 61, 61);
  }
    #meter::before {
    border: 1px solid black;
  }
  #indicator {
    border-radius: 100%;
    height: 200px;
    border: 1px solid black;
    aspect-ratio: 1/1;
  }
    #indicator::before {
    top: -3px;
    padding: 4px;
    border: 3px solid var(--primary-bg);
  }
}

              
            
!

JS

              
                /*
Details:

Current U.S AQI EPA(Environmental Protection Agency) format, PM(Particle Matter) 2.5, Live Data, Nearest Station based off Geolocation. Made using Vanilla HTML,CSS & JS. PM SVG(Scalable Vector Graphic) made using Figma and a Degree Calculation Formula for AQI Animation The AQI values range from 0 to 500, and since the indicator's animation is circular. The formula takes an AQI value, divides it by 500, and then scales the result to fit within a range of 5 to 355 degrees (which corresponds to the circular indicator's correct position relative to the current AQI ).Open to Suggestion,Questions,Feedback. Thanks.

API info:

Free API key  can be found at:
https://www.iqair.com/commercial-air-quality-monitors/api
The free option alllows 10,000 calls/monthy.
*/
/*EXAMPLE START: 
AQI and DEG Stat Calculations Shown in Console as they increment for further analysis on how the two main variables of the Degree Calculation Formula for AQI Animation work.
*/
const currentAqi = document.getElementById("current-aqi");
const indicator = document.getElementById("indicator");

function calculateValue(aqi) {
  return (aqi / 500) * 350 + 5;
}

let aqi = 0;
let deg = calculateValue(aqi);
let intervalId;

function updateValues() {
  aqi++;
    deg = calculateValue(aqi);
    console.log(`AQI: ${aqi}, DEG: ${deg.toFixed(2)}`);
    currentAqi.innerText= aqi;
  indicator.style.rotate =`${deg}deg`;
//current AQI simulation number 250
  if (aqi === 250) {
    clearInterval(intervalId);
  }
}

intervalId = setInterval(updateValues, 30);
/*EXAMPLE END*/

/*
Below is the method for hooking up realtime aqi data from iqair.com
which reaches out to 80,000 sensors worldwide City level data
Overall AQI (US & China)
Real-time weather data
// DOM elements
const currentAqi = document.getElementById("current-aqi");
const indicator = document.getElementById("indicator");
// API key
const key = "YOUR API KEY HERE";
// Geolocation coordinates
let latitude;
let longitude;

// Function to update geolocation
function updateGeolocation(position) {
  latitude = position.coords.latitude;
  longitude = position.coords.longitude;
}

// Check if geolocation is available
function checkGeolocation() {
  if ("geolocation" in navigator) {
    // Get the current geolocation
    navigator.geolocation.getCurrentPosition(updateGeolocation);
  } else {
    console.log("Geolocation is not available.");
  }
}

// Fetch data from the API
function fetchData() {
  const apiUrl = `https://api.airvisual.com/v2/nearest_city?lat=${latitude}&lon=${longitude}&key=${key}`;
  // Fetch data from the API
  fetch(apiUrl).then(handleResponse).then(processData).catch(handleError);
}

// Handle response from API
function handleResponse(response) {
  if (!response.ok) {
    throw new Error(`HTTP error! Status: ${response.status}`);
  }
  return response.json(); // Parse the response as JSON
}

// Process data and update values
function processData(data) {
  const calculateValue = (aqi) => (aqi / 500) * 350 + 5;
  let aqi = 0;
  let result = calculateValue(aqi);
  let intervalId;

  // Update AQI values and rotation
  function updateValues() {
    console.log(`AQI: ${aqi}, DEG: ${result}`);

    // Update the AQI display using SVG code
    currentAqi.innerHTML = `${aqi}<br>`;

    // Update the rotation of the indicator
    indicator.style.rotate = `${result}deg`;

    // Increment AQI and calculate corresponding rotation
    aqi += 1;
    result = calculateValue(aqi);

    // Check if the target AQI has been reached
    if (aqi > data.data.current.pollution.aqius) {
      clearInterval(intervalId);
    }
  }

  // Set interval for updating values
  intervalId = setInterval(updateValues, 100);
}

// Handle errors during data fetching
function handleError(error) {
  console.error("Fetch error:", error);
}

// Initiate data retrieval and updates
function initializeApp() {
  checkGeolocation();
  fetchData();
}

// Call the initializeApp function
initializeApp();
*/
              
            
!
999px

Console