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ECHO Clean Air Tracking Tool - Air Monitoring Stations

The ECHO Clean Air Tracking Tool (ECATT) is a US EPA interface and repository for Clean Air Act data that can be used to evaluate emissions at stationary sources of air pollution and analyze general air quality.

The Air Monitoring Station (AMS) search provides data about U.S. air monitoring stations that measure ambient or outdoor concentrations of Hazardous Air Pollutants (HAPs) and Criteria Air Pollutants (CAPs). The search can be used to identify areas with high pollutant concentrations and higher potential for health impacts and identify the facilities emitting in those areas. Read more about HAPs and CAPs.

The AMS search also incorporates AirToxScreen modeled data so users can identify areas with elevated cancer risk or higher potential for other health impacts and compare those areas to nearby emissions concentrations measured by air monitors to identify potential risk hotspots. Users can screen facilities for further evaluation by identifying measured pollutant concentrations larger than the modeled amount.

Search Type

Geographic Location

Basic View

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Monitored location within 5km of RCRA LQG or TSDF

Nonattainment Area More Info

Monitor located in Nonattainment Area

Community

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Environmental Justice
EJScreen Indexes At or Above 80th Percentile
Compare to
Based on
Index Type
Count of Indexes
Demographics

Monitored Risk Level

Monitored Concentrations

Basic View

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Ambient Air Quality Monitoring

Define Year as Define Years As Information
 
NAAQ Standard
Air Concentration Trend
>= (people in a million)
>=
Compare to Modeled Ambient Concentrations
>= times the modeled values

Modeled Risk Screening

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Click for help 2019 AirToxScreen More Info
  No Restrictions
  Air Toxics Cancer Risk Level (in a million)
 
>=
  Air Toxics Respiratory Hazard Index
 
>=

Search Criteria Selected

Search Type

 

Geographic Location

Clear Facilities within selection. Facilities within
 
Clear ZIP Code selection. ZIP Code
 
Clear EPA Region selection. EPA Region
 
Clear Regional Planning Office selection. Regional Planning Office
 
Clear State selection. State
 
Clear County selection. County
 
Clear City selection. City
 
Clear Located on Tribal Land selection. Located on Tribal Land
 
Clear Location Type selection. Location Type
 
Clear Monitored location within 5km of <br/>RCRA <abbr title="Large Quantity Generator">LQG</abbr> or <abbr title="Treatment, Storage and Disposal Facility">TSDF</abbr> selection. Monitored location within 5km of
RCRA LQG or TSDF
 
Clear AMA Site Code(s) selection. AMA Site Code(s)
 
Clear AQS Site Code(s) selection. AQS Site Code(s)
 
Clear Monitor located in Nonattainment Area selection. Monitor located in Nonattainment Area
 
Clear Nonattainment Area Pollutant selection. Nonattainment Area Pollutant
 
Clear Nonattainment Area Severity selection. Nonattainment Area Severity
 
Clear Nonattainment Area Classification selection. Nonattainment Area Classification
 
Clear Monitored Pollutants Correspond to Nonattainment selection. Monitored Pollutants Correspond to Nonattainment
 
Clear Population Density Greater than selection. Population Density Greater than
 

Community

Clear EJScreen Indexes At or Above 80th Percentile selection. EJScreen Indexes At or Above 80th Percentile
 
Compare To
 
Based On
 
Index Type
 
Clear Percent People of Color (3-mile radius) selection. Percent People of Color (3-mile radius)
 
Clear Percent Low Income (3-mile radius) selection. Percent Low Income (3-mile radius)
 

Monitored Risk Level

Monitored Concentrations

Define Year as
 
Clear Timeframe selection. Timeframe
 
Clear  selection.  
Clear Pollutant Name selection. Pollutant Name
 
Clear Pollutant Name selection. Pollutant Name
 
Clear Pollutant Standard selection. Pollutant Standard
 
Clear CAS Number selection. CAS Number
 
Clear NAAQ Standard selection. NAAQ Standard
 
Clear Air Concentration Trend selection. Air Concentration Trend
 
Clear Comparison to NAAQS selection. Comparison to NAAQS
 
Clear Number of NAAQS Exceedances selection. Number of NAAQS Exceedances
 
Clear Average Long-Term Cancer Risk Level selection. Average Long-Term Cancer Risk Level
 
Clear Hazard Quotient Level: Target System selection. Hazard Quotient Level: Target System
 
Clear Hazard Quotient Level: >= selection. Hazard Quotient Level: >=
 
Clear Compare to Modeled Ambient Concentrations selection. Compare to Modeled Ambient Concentrations
 
Clear 75% of ambient daily average measurements reported are >= [] times the modeled values selection. 75% of ambient daily average measurements reported are >= [] times the modeled values
 
Clear Set Non-Detects Equal To selection. Set Non-Detects Equal To
 
Clear Exclude Results with More Than 80% Non-Detects selection. Exclude Results with More Than 80% Non-Detects
 

Modeled Risk Screening

Clear 2019 AirToxScreen Long-Term Cancer Risk Level: Aggregate selection. 2019 AirToxScreen Long-Term Cancer Risk Level: Aggregate
 
Clear 2019 AirToxScreen Long-Term Cancer Risk Level: Cancer Risk selection. 2019 AirToxScreen Long-Term Cancer Risk Level: Cancer Risk
 
Clear 2019 AirToxScreen Long-Term Cancer Risk Level: >= selection. 2019 AirToxScreen Long-Term Cancer Risk Level: >=
 
Clear 2019 AirToxScreen Long-Term Cancer Risk Level: Pollutant selection. 2019 AirToxScreen Long-Term Cancer Risk Level: Pollutant
 
Clear 2019 AirToxScreen Hazard Level:  selection. 2019 AirToxScreen Hazard Level:
 
Clear 2019 AirToxScreen Hazard Level: Target System selection. 2019 AirToxScreen Hazard Level: Target System
 
Clear 2019 AirToxScreen Hazard Level >= selection. 2019 AirToxScreen Hazard Level >=
 
Clear 2019 AirToxScreen Hazard Level: Pollutant selection. 2019 AirToxScreen Hazard Level: Pollutant
 

Define Year As Information

"Define Year As" allows you to select either the "Best Rolling 12 Months of Data" or "Calendar Year." EPA established the following criteria to select the Best Rolling 12 Months of Data to represent annual concentrations:

  • The annual data set must comprise at least three valid quarters of data; and
  • Valid quarters must have at least 70% of expected measurements for a pollutant.

See the Air Monitoring Station Data Rules and Calculations page for more information.

NAAQ Standard Information

"NAAQ Standard" allows you to select only the Primary pollutant standard, only the Secondary pollutant standard, or not specify by selecting "No Restrictions." EPA established the following criteria to define the two standards:

  • Primary standards provide public health protection, including protecting the health of "sensitive" populations such as asthmatics, children, and the elderly.
  • Secondary standards provide public welfare protection, including protection against decreased visibility and damage to animals, crops, vegetation, and buildings.

See the EPA NAAQS Table for more information.

EJScreen Indexes for Air Monitoring Stations

Select air monitoring stations located in areas with an 80th or higher percentile of one or more of the supplemental indexes of EJScreen, EPA's screening tool for environmental justice (EJ) concerns. EPA uses these indexes to identify geographic areas that may warrant further consideration or analysis for potential EJ concerns.

Note that use of this criterion does not designate an area as an "EJ community" or "EJ facility." EJScreen provides screening level indicators, not a determination of the existence or absence of EJ concerns. For more information, see the EJScreen home page.

EJScreen Indexes: Index Type

Select from two methodologies for calculating EJScreen indexes. The indexes are a combination of environmental and socioeconomic information.

The Supplemental Index uses a five-factor demographic index that averages Percent Low Income , Percent Unemployed , Percent Limited English Speaking, Percent Less than High School Education, and Low Life Expectancy.

The Environmental Justice Index uses a two-factor demographic index that averages Percent Low Income and Percent People of Color.

EJScreen Indexes: Based On

This option selects whether the EJScreen index percentiles of a facility are calculated based on a facility’s Census block group or 1-mile maximum. The default is Census block group.

EJScreen Indexes: Compare To

This option selects whether national percentiles or state percentiles are used when determining if a location has one or more of EJScreen's indexes at or above the 80th percentile. The default is national percentiles.

AMA Site Code

The Ambient Monitoring Archive (AMA) Site Code identifies a unique Ambient Monitoring Station (AMS). Search for multiple IDs by using a comma-separated list. 

AQS Site Code

The AQS Site Code is a 9-digit unique identifier for the air monitoring station, created based on the combination of the State code + County code + Site Code. For example: 06 (state code) + 073 (county code) + 1201 (site code) = 060731201.

Site codes are unique for stations within a county. If only a site code is provided, ECATT will display all air monitoring stations with that site code. Similarly, ECATT will display all air monitoring stations within the state or county if only a state or county code is given respectively. You can search for multiple IDs by using a comma-separated list.

Nonattainment Area

 A nonattainment area is an area that does not meet one or more of the National Ambient Air Quality Standards (NAAQS) for six commonly found air pollutants ("criteria pollutants") designated in the Clean Air Act: particle pollution (often referred to as particulate matter), ground-level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead.

Nonattainment areas are given a classification based on the severity of the violation and the type of air quality standard they exceed. 

Chemical Abstract Service (CAS) Number

A Chemical Abstract Service (CAS) number is a number assigned by the American Chemical Society that uniquely identifies a chemical.

Average Long-Term Cancer Risk Level

A risk level of “N”-in-1 million implies a likelihood that up to “N” people, out of one million equally exposed people would contract cancer if exposed continuously (24 hours per day) to the specific average concentration over 70 years (an assumed lifetime). This would be in addition to those cancer cases that would normally occur in an unexposed population of one million people.

When the pollutant selected is "Aggregate Pollutants" this searches for the cumulative risk for all monitored pollutants at a station. This search option allows users to identify areas of potential cancer risk and is not intended to provide a comparison between stations, as stations may monitor for different numbers and types of pollutants.

Hazard Quotient Level

Search for monitors measuring air pollutant concentrations exceeding a specific hazard quotient level. Select a specific target organ or organ system and a hazard quotient level of 1, 2, 10, 25, 50 or 100. Hazard quotient indicates the ratio of the potential exposure to an air pollutant and the level at which no adverse effects are expected. A hazard quotient less than or equal to 1 indicates that adverse effects are not likely to occur, and thus can be considered to have negligible hazard.

Compare Ambient Daily Average Measurements to Modeled Concentrations

Select "Yes" to compare the monitored pollutant concentrations to AirToxScreen modeled pollutant concentrations. Set a factor to compare 75% of ambient daily average pollutant measurements against the modeled values.  

Non-Detection Methods

When a pollutant concentration is reported as "not detected," its actual concentration may be zero or some value between zero and the detection limit. The user can choose to calculate the average pollutant concentration using one of three methods: setting all non-detects to zero, setting all non-detects to ½ the detection limit, or using the regression method. By default, non-detects are set to use regression method. See the Air Monitoring Station Data Rules and Calculations for more information. 

Modeled Risk Screening

AirToxScreen is EPA's comprehensive evaluation of air toxics in the United States, based on modeled air quality. These activities include the expansion of air toxics monitoring, improvement and periodic updating of emission inventories, improvement of national- and local-scale modeling, continued research on health effects and exposures to both ambient and indoor air, and improvement of assessment tools. AirToxScreen provides a snapshot of the outdoor air quality and the risks to human health that would result if air toxic emission levels remained unchanged. More information on AirToxScreen can be found on the EPA AirToxScreen Frequently Asked Questions page.

Air Toxics Cancer Risk Level

A risk level of “N”-in-1 million implies a likelihood that up to “N” people, out of one million equally exposed people would contract cancer if exposed continuously (24 hours per day) to the specific concentration over 70 years (an assumed lifetime). This would be in addition to those cancer cases that would normally occur in an unexposed population of one million people. Note that this assessment looks at lifetime cancer risks, which should not be confused with or compared to annual cancer risk estimates. If you would like to compare an annual cancer risk estimate with the results in this assessment, you would need to multiply that annual estimate by a factor of 70 or alternatively divide the lifetime risk by a factor of 70.

Select a Pollutant through the lookup. Then select a Cancer Risk and risk level. For example, searching on "Formaldehyde" and "Background > 25" will return ambient emission stations where the cancer risk level for the pollutant is greater than 25 in 1 million.

Cancer Risk Types

  • Background – Background pollution that exists in the air that does not come from a specific source. These pollutants may come from a natural source or from distance sources.  Background concentrations can explain pollutant concentrations found even without recent human-caused emissions.
  • Biogenics – Natural sources of emissions, which include trees, plants and soil microbes.
  • Fires – Emissions from fires that do not include residential wood combustion.
  • Non-point – Non-point sources from the National Emissions Inventory (NEI) (https://www.epa.gov/air-emissions-inventories/national-emissions-invent…) that have geographic coordinates present in the NEI and emit at least one hazardous air pollutant. Non-point sources in the NEI are individually too small in magnitude to report as point sources.  These emissions sources are included in the NEI as a county total or tribal total (for participating tribes).  Examples include residential heating, commercial combustion, asphalt paving, and commercial and consumer solvent use.
  • Non-Road – Mobile sources used on roads and highways for transportation of passengers or freight. On-road sources include:
    • passenger cars and trucks;
    • commercial trucks and buses; and
    • motorcycles
  • On Road – Mobile sources used on roads and highways for transportation of passengers or freight. On-road sources include:
    • passenger cars and trucks;
    • commercial trucks and buses; and
    • motorcycles
  • Point – Point sources from the National Emissions Inventory (NEI) (https://www.epa.gov/air-emissions-inventories/national-emissions-invent…) that have geographic coordinates present in the NEI and emit at least one hazardous air pollutant. Point sources in the NEI include large industrial facilities and electric power plants, airports, and smaller industrial, non-industrial and commercial facilities.  A small number of portable sources such as some asphalt or rock crushing operations are also included.
  • Residential Wood – Residential wood heating, which include wood stoves and fireplaces. This source is separate from Fires due to the temporalization of this source, since the amount of wood burnt depends on the daily temperature.
  • Secondary Formation – Pollutants formed by atmospheric transformation, which is the process by which chemicals are transformed into other chemicals in the air (atmosphere). When a chemical is transformed the original pollutant no longer exists; it is replaced by one or more new chemicals. Compared to the original chemical, the transformed chemical(s) can have more, less or the same toxicity. 
     

Air Toxics Hazard Quotient and Hazard Index

Hazard Quotient indicates the ratio of the potential exposure to an air pollutant and the level at which no adverse effects are expected for an organ or organ system. A hazard quotient less than or equal to 1 indicates that adverse effects are not likely to occur, and thus can be considered to have negligible hazard.

Hazard Index is the sum of hazard quotients for substances that affect the same target organ or organ system. Because different air toxics can cause similar adverse health effects, combining hazard quotients from different toxics is often appropriate. A hazard index (HI) of 1 or lower means air toxics are unlikely to cause adverse noncancer health effects over a lifetime of exposure. 

Target System

The target organ or organ system affected by the Hazard Quotient or Hazard Index. For example, searching on "Respiratory System > 2" will return the ambient monitoring stations located in areas where the hazard quotient or hazard index level is greater than 2.

Selecting Hazard Quotient and a Single Pollutant restricts the list of target systems to those affected by the pollutant.

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