Air Quality Index

Think of the AQI as a yardstick that runs from 0 to 500. 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.

Air Quality Index

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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.

Five major pollutantsEPA 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:

Different countries and regions use different scales to report air quality based on local pollution and health considerations. There are dozens of local indexes used across the globe. For example, some states in Australia use a number-based system while others use a category-based system. Canada, US, and Japan define separate air quality indexes, as does the European Environment Agency.

As the air pollution worsens, public health risks increase. It especially affects children, the older adult population, and other at-risk populations. During times of poor air quality, governmental agencies generally provide health recommendations related to indoor and outdoor activities.

Air Quality Index (AQI) is the way different governments choose to communicate air quality to the public. It's a means to convert the level of different pollutants into one index in a digestible manner.

Air quality levels are calculated based on air quality stations measurements. We provide you with a map of all stations in your area to get a more comprehensive picture of the air quality information. However, the air quality between the stations may vary, and the AQI level at the closest station to you doesn't necessarily reflect the AQI level at your specific location. To avoid confusion, we show a map-based view to display the AQI level at given stations around you.

Note: As of May 2023, the old MNAir app has been retired and no longer supported. Please remove the app from your mobile device and download the new AirNow app to get current air quality conditions.

The Air Quality Index (AQI) is used for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air. EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution (also known as particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide. For each of these pollutants, EPA has established national air quality standards to protect public health .Ground-level ozone and airborne particles are the two pollutants that pose the greatest threat to human health in this country.

The Oregon Water Quality Index analyzes a defined set of water quality variables and produces a score describing general water quality for a particular monitoring site in the ambient monitoring network. Scores correspond to a water quality status and are evaluated for improving or declining trends at each site. The status and trend analyses incorporate 10 years (currently water years 2013-2022) of water quality data.

Ever hear your local weather forecast say that tomorrow will be a "code orange" day for air pollution? That's the Air Quality Index at work. The Air Quality Index, or AQI, is the system used to warn the public when air pollution is dangerous. The AQI tracks ozone (smog) and particle pollution (tiny particles from smoke, power plants and factories, vehicle exhaust, and other sources), as well as four other widespread air pollutants. Newspapers, radio, television, and websites report AQI levels year-round. Keeping track of the current air quality information in your area can help you take steps to protect yourself, children, and others from unhealthy levels of air pollution.

Air pollution can harm anyone, but it can be especially dangerous for many people, including children and teens, people with asthma and other lung diseases, anyone over 65, people who have diabetes or cardiovascular disease or who are pregnant. Even healthy adults who exercise or work outdoors can be harmed. Being aware of when the air quality is bad gives you the chance to take steps to protect your health.

Air pollution levels are measured daily and ranked on a scale of 0 for perfect air all the way up to 500 for air pollution levels that pose an immediate danger to the public. The AQI breaks air pollution levels into six categories, each of which has a name, an associated color, and advice to go along with it. AQI values at or below 100 are considered satisfactory for almost everyone. When AQI values are above 100, air quality is unhealthy. The higher the number, the more people are at risk of health harm.

The DNR uses weather forecasts and data from air monitoring sites to determine air quality throughout the state, and notifies residents in real time when pollutants reach unhealthy levels. The DNR uses the U.S. EPA's Air Quality Index (AQI) to inform the public of current pollutant levels. The AQI uses colors and corresponding numbers to communicate the current air quality for air pollutants regulated by the Clean Air Act. To protect public health, the DNR issues an air quality advisory for a county when the AQI exceeds, or is expected to exceed, the ozone or fine particle (PM2.5) standard.

The monitoring data presented on this webpage contains real-time continuous data that have not been through a full quality assurance review. These data should be considered unofficial. Data in reports may not follow all rounding/truncation conventions required for comparison to the regulatory National Ambient Air Quality Standards. For details, see the Information tab.

The U. S. Environmental Protection Agency (EPA) has provided a scale called the Air Quality Index (AQI) for rating air quality. This scale is based on the National Ambient Air Quality Standards (NAAQS) and is described in the Code of Federal Regulations, Part 58, Appendix G. This report is based on the AQI standards. More information on the AQI can be found on the EPA's AirNow web site.

PLEASE NOTE: This data has not been verified by the TCEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from TCEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.

Applications: The DQI-R reflects the dietary guidance principles of macronutrient distribution, moderation, variety, and proportionality. Although the index was designed to monitor dietary changes in populations rather than individuals, each index component reflects an aspect of national dietary guidance. Calculation of DQI-R scores for an individual should provide an estimate of diet quality relative to national guidelines, and differences in scores over time should suggest improvement or decline in overall diet quality.

Objective: Data for 5,484 adults (aged 21 years and older) who participated in the 1987-88 Nationwide Food Consumption Survey (NFCS) were used to develop an index of overall dietary intake that related to the major, diet-related, chronic diseases in the United States. The low response rate of the 1987-88 NFCS has raised concerns about potential bias, but this large data set is useful for methodologic studies and research that does not attempt to generalize the results to the US population.

Analyses: Dietary recommendations from the 1989 National Academy of Sciences publication Diet and Health were stratified into three levels of intake for scoring. Individuals who met a dietary goal were given a score of zero. Those who did not meet a goal, but had a fair diet, were given one point, and those who had a poor diet were given two points. These points were summed across eight diet variables to score the index from zero (excellent diet) to 16 (poor diet).

Results: Lower index scores were positively associated with high intakes of other important measures of diet quality (eg, fiber, vitamin C). We found that single nutrients (such as dietary fat) were not necessarily associated with other measures of diet quality.

Conclusion: We concluded that this index ranking of overall dietary patterns was reflective of total diet quality, though substantial misclassification can result from using single nutrients or foods as indicators of diet quality.

Checking local air quality can help you plan your day. The following chart includes today's forecast for air quality, access to tomorrow's forecast as well as real-time readings on EPA's Air Quality Index.

During the ozone season this real time Air Quality Index report is used as the basis for the Ozone Action Day programs in the St. Louis and Kansas City areas. An index of 100 represents a threshold level of pollution, which may cause health problems in normally healthy humans. However, sensitive individuals or highly active individuals may experience health effects at lower concentrations of pollutants. 2351a5e196