`; // this creates the Tool Tip cw 2025-01-10 // Initialize Tippy.js on the globe icon tippy('#espanolBetaLabel', { content: `

Español Beta

AirNow is beta testing a Spanish language translation of our entire web site.

`, allowHTML: true, placement: 'bottom', zIndex: 9999, offset: [-75, 100], theme: "marquee", animation: "shift-toward", // shift toward; scale delay: [300, 100], interactiveBorder: 5, arrow: true, }); tippy('#globeIcon', { content: `

Español Beta

AirNow is beta testing a Spanish language translation of our entire web site.

`, allowHTML: true, placement: 'bottom', zIndex: 9999, offset: [-75, 100], theme: "marquee", animation: "shift-toward", // shift toward; scale delay: [300, 100], interactiveBorder: 5, arrow: true, }); // For Mobile Hamburger menu ONLY cw 2025-01-27 // Check if the viewport width is less than 767 pixels if (window.innerWidth alows the normal button styles to be used cw 2025-01-28 globeLanguageSwitcher.style.border = ''; // Reposition the search icon var searchIcon = document.getElementById('search-btn'); if (searchIcon) { searchIcon.style.paddingRight = '6px'; searchIcon.style.paddingLeft = '6px'; } // Add event listener to handle the mobile drop down menu cw 2025-012-28 document.getElementById('globeIcon').addEventListener('click', function() { // hide menu on second click cw 2025-01-28 if (globeLanguageSwitcher.style.display === 'none') { globeLanguageSwitcher.style.display = 'block'; } else { globeLanguageSwitcher.style.display = 'none'; } if (window.location.href.includes('espanol.airnow.gov')) { globeLanguageSwitcher.textContent = 'English'; // Display English } else { globeLanguageSwitcher.textContent = 'Español'; // Display Espanol } }); // Add event listener to handle the actual language change cw 2025-012-23 document.getElementById('globeLanguageSwitcher').addEventListener('click', function() { if (window.location.href.includes('espanol.airnow.gov')) { // send to English window.location.href = 'https://www.airnow.gov/' + displayPath; // switch to English cw 2025-01-16 } else { window.location.href = 'https://espanol.airnow.gov/' + displayPath; // switch to Spanish cw 2025-01-16 } }); } else { // For Desktop // Set the "switcher" to display the opposite of the current language cw 2025-01-10 if (window.location.href.includes('espanol.airnow.gov')) { // then set to Spanish globeLanguageSwitcher.textContent = 'English'; espanolBetaLabel.style.display = 'none'; globeLanguageSwitcher.style.display = 'block'; } else { // then set to English globeLanguageSwitcher.textContent = 'Español'; espanolBetaLabel.style.display = 'block'; globeLanguageSwitcher.style.display = 'none'; } // Add event listener to handle the actual language change cw 2025-012-23 document.getElementById('globeIcon').addEventListener('click', function() { if (window.location.href.includes('espanol.airnow.gov')) { // send to English window.location.href = 'https://www.airnow.gov/' + displayPath; // switch to English cw 2025-01-16 } else { window.location.href = 'https://espanol.airnow.gov/' + displayPath; // switch to Spanish cw 2025-01-16 } }); // Add event listener to toggle dropdown visibility when "Espanol Beta" is clicked document.getElementById('espanolBetaLabel').addEventListener('click', function() { // go straight to spanish window.location.href = 'https://espanol.airnow.gov/' + displayPath; // switch to Spanish cw 2025-01-16 }); // Add event listener to handle the actual language change document.getElementById('globeLanguageSwitcher').addEventListener('click', function() { if (window.location.href.includes('espanol.airnow.gov')) { // send to English window.location.href = 'https://www.airnow.gov/' + displayPath; // switch to English cw 2025-01-16 } else { window.location.href = 'https://espanol.airnow.gov/' + displayPath; // switch to Spanish cw 2025-01-16 } }); } // end of Desktop var element = document.getElementById('recursos-en-español-btn'); element.style.display = 'block'; // Make the element visible again }

Air Quality Index (AQI) Basics

What is the U.S. Air Quality Index (AQI)?

The U.S. AQI is EPA’s index for reporting air quality.

How does the AQI work?

The U.S. Air Quality Index (AQI) is EPA's tool for communicating about outdoor air quality and health. The AQI includes six color-coded categories, each corresponding to a range of index values. The higher the AQI value, the greater the level of air pollution and the greater the health concern. For example, an AQI value of 50 or below represents good air quality, while an AQI value over 300 represents hazardous air quality.

For each pollutant an AQI value of 100 generally corresponds to an ambient air concentration that equals the level of the short-term national ambient air quality standard for protection of public health. AQI values at or below 100 are generally thought of as satisfactory. When AQI values are above 100, air quality is unhealthy: at first for certain sensitive groups of people, then for everyone as AQI values get higher.

The AQI is divided into six categories. Each category corresponds to a different level of health concern. Each category also has a specific color. The color makes it easy for people to quickly determine whether air quality is reaching unhealthy levels in their communities.

AQI Basics for Ozone and Particle Pollution
Daily AQI Color Levels of Concern Values of Index Description of Air Quality
Green Good 0 to 50 Air quality is satisfactory, and air pollution poses little or no risk.
Yellow Moderate 51 to 100 Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Orange Unhealthy for Sensitive Groups 101 to 150 Members of sensitive groups may experience health effects. The general public is less likely to be affected.
Red Unhealthy 151 to 200 Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.
Purple Very Unhealthy 201 to 300 Health alert: The risk of health effects is increased for everyone.
Maroon Hazardous 301 and higher Health warning of emergency conditions: everyone is more likely to be affected.

 AQI Basics for Ozone and Particle Pollution Table print version (pdf, 163KB, 1p.)

See the Activity Guides to learn ways to protect your health when the AQI reaches unhealthy levels.

Five major pollutants

EPA establishes an AQI for five major air pollutants regulated by the Clean Air Act. Each of these pollutants has a national air quality standard set by EPA to protect public health:

  • ground-level ozone
  • particle pollution (also known as particulate matter, including PM2.5 and PM10)
  • carbon monoxide
  • sulfur dioxide
  • nitrogen dioxide

Using the Air Quality Index
Technical Assistance Document for the Reporting of Daily Air Quality – the Air Quality Index (AQI)