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Ozone (1-hr Avg)
Ozone (8-hr Avg)
Ozone Nowcast Air Quality Index Ozone Nowcast air quality index information icon
Particulate PM2.5 icon
PM2.5 (1-hr Avg)
PM2.5 (Nowcast Avg)
PM2.5 Nowcast Air Quality Index Particulates PM2.5 air quality index information icon
Particulate PM10 icon
PM10 (1-hr Avg)
PM10 (24-hr Avg)
PM10 Air Quality Index Particulates PM10 air quality index information icon
Particulate PM2.5 icon

Low Cost Sensor

PM2.5 Nowcast Air Quality Index Particulates PM2.5 Nowcast air quality index information icon
Temperature icon
Temperature
°
Wind
Precipitation icon
Precipitation
Relative humidity icon
Humidity
Peak Wind
Peak Wind Speed
Solar radiation icon
Solar Radiation
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Visibility
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Recent Data

Select a time frame for the data. Expand parameters to reveal graphed data. Drag-and-drop parameters to display in any order or hide unwanted parameters. Tabular data is at the bottom of this section.
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Remove chart icon Ozone
Ozone chart (data available in table below)
Ozone Air Quality IndexOzone air quality index information icon
  • Ozone air quality index icon for good condition (green)Good
  • Ozone air quality index icon for moderate condition (yellow)Moderate
  • Ozone air quality index icon for unhealthy-for-sensitive-groups condition (orange)Unhealthy for Sensitive Groups
  • Ozone air quality index icon for unhealthy condition (red)Unhealthy
  • Ozone air quality index icon for very-unhealthy condition (purple)Very Unhealthy
  • Ozone air quality index icon for no data (gray)No Data Available
Understanding Ozone | Data Disclaimer | Export Chart
Remove chart icon Particulate Matter (PM2.5)
Particulate matter (PM2.5) chart (data available in table below)
Particulate Matter (PM2.5) Nowcast Air Quality Index Particulates PM2.5 air quality index information icon
  • Particulate (PM2.5) matter air quality index icon for good condition (green)Good
  • Particulate matter (PM2.5) air quality index icon for moderate condition (yellow)Moderate
  • Particulate matter (PM2.5) air quality index icon for unhealthy-for-sensitive-groups condition (orange)Unhealthy for Sensitive Groups
  • Particulate matter (PM2.5) air quality index icon for unhealthy condition (red)Unhealthy
  • Particulate matter (PM2.5) air quality index icon for very-unhealthy condition (purple)Very Unhealthy
  • Particulate matter (PM2.5) air quality index icon for hazardous condition (maroon)Hazardous
  • Particulate matter (PM2.5) air quality index icon for no data (gray)No Data Available
Understanding Particulate Matter | Data Disclaimer | AirNow Fire and Smoke Map | Export Chart
Remove chart icon Particulate Matter (PM10)
Particulate matter (PM10) chart (data available in table below)
Particulate matter (PM10) Air Quality Index Particulates PM10 air quality index information icon
  • Particulate (PM10) matter air quality index icon for good condition (green)Good
  • Particulate matter (PM10) air quality index icon for moderate condition (yellow)Moderate
  • Particulate matter (PM10) air quality index icon for unhealthy-for-sensitive-groups condition (orange)Unhealthy for Sensitive Groups
  • Particulate matter (PM10) air quality index icon for unhealthy condition (red)Unhealthy
  • Particulate matter (PM10) air quality index icon for very-unhealthy condition (purple)Very Unhealthy
  • Particulate matter (PM10) air quality index icon for hazardous condition (maroon)Hazardous
  • Particulate matter (PM10) air quality index icon for no data (gray)No Data Available
Understanding Particulate Matter | Data Disclaimer | Export Chart
Remove chart iconLow Cost Sensor Particulate Matter (PM2.5)
PA Particulate matter (PM2.5) chart (data available in table below)
Particulate Matter (PM2.5) Nowcast Air Quality Index Particulates PM2.5 air quality index information icon
  • Particulate (PM2.5) matter air quality index icon for good condition (green)Good
  • Particulate matter (PM2.5) air quality index icon for moderate condition (yellow)Moderate
  • Particulate matter (PM2.5) air quality index icon for unhealthy-for-sensitive-groups condition (orange)Unhealthy for Sensitive Groups
  • Particulate matter (PM2.5) air quality index icon for unhealthy condition (red)Unhealthy
  • Particulate matter (PM2.5) air quality index icon for very-unhealthy condition (purple)Very Unhealthy
  • Particulate matter (PM2.5) air quality index icon for hazardous condition (maroon)Hazardous
  • Particulate matter (PM2.5) air quality index icon for no data (gray)No Data Available
Understanding Particulate Matter | Data Disclaimer | AirNow Fire and Smoke Map |Export Chart
Remove sulfur dioxide (SO2) chart icon Sulfur Dioxide (SO2)
Sulfur Dioxide (SO2) chart (data available in table below)
Data Disclaimer | Export Chart
Remove wind direction chart icon Wind Direction
Wind direction chart (data available in table below)
Data Disclaimer | Export Chart
Remove wind speed chart icon Wind Speed
Wind speed chart (data available in table below)
Data Disclaimer | Export Chart
Remove peak wind speed chart icon Peak Wind Speed
Peak wind speed chart (data available in table below)
Data Disclaimer | Export Chart
Remove temperature chart icon Temperature
Temperature chart (data available in table below)
Data Disclaimer | Export Chart
Remove relative humidity chart icon Humidity
Relative humidity chart (data available in table below)
Data Disclaimer | Export Chart
Remove precipitation chart icon Precipitation
Precipitation chart (data available in table below)
Data Disclaimer | Export Chart
Remove solar radiation chart icon Solar Radiation
Solar radiation chart (data available in table below)
Data Disclaimer | Export Chart
Remove barometric pressure chart icon Barometric Pressure
Barometric pressure chart (data available in table below)
Data Disclaimer | Export Chart
Remove visibility chart icon Visibility
Visibility chart (data available in table below)
Data Disclaimer | Export Chart
Remove carbon monoxide (CO) chart icon Carbon Monoxide (CO)
Carbon Monoxide (CO) chart (data available in table below)
Data Disclaimer | Export Chart
Remove nitrogen oxide (NO) chart icon Nitrogen Oxide (NO)
Nitrogen Oxide (NO) chart (data available in table below)
Data Disclaimer | Export Chart
Remove nitrogen dioxide (NO2) chart icon Nitrogen Dioxide (NO2)
Nitrogen Dioxide (NO2) chart (data available in table below)
Data Disclaimer | Export Chart
Remove total reactive oxides of nitrogen (NOx) chart icon Total Reactive Oxides of Nitrogen (NOx)
Total Reactive Oxides of Nitrogen (NOx) chart (data available in table below)
Data Disclaimer | Export Chart
Remove total reactive oxides of nitrogen (NOy) chart icon Total Reactive Oxides of Nitrogen (NOy)
Total Reactive Oxides of Nitrogen (NOy) chart (data available in table below)
Data Disclaimer | Export Chart
Remove chart iconGround Level Smoke Forecast
24-Hour Ground Level Smoke Forecast
24-Hour Ground Level Smoke Forecast Air Quality Index Ground level smoke forecast air quality index information icon

The EPA air quality index (AQI) categories below are for particulate matter, based on modeled smoke.
Particulates from other sources are present but are not included in the estimated AQI.
Hover over the map symbols above for more detailed forecast information.
  • Ground level smoke forecast no smoke in the forecast (gray)No smoke in the forecast
  • Ground level smoke forecast air quality index icon for good condition (green), indcating either minimal or no smoke impactsGood, indicating minimal smoke in the forecast
  • Ground level smoke forecast air quality index icon for moderate condition (yellow)Moderate
  • Ground level smoke forecast air quality index icon for unhealthy-for-sensitive-groups condition (orange)Unhealthy for Sensitive Groups
  • Ground level smoke forecast air quality index icon for unhealthy condition (red)Unhealthy
  • Ground level smoke forecast air quality index icon for very-unhealthy condition (purple)Very Unhealthy
  • Ground level smoke forecast air quality index icon for hazardous condition (maroon)Hazardous
  • Ground level smoke forecast air quality data are not available (gray)Data not Available
Understanding 24-Hour Ground Level Smoke Forecasts | AirNow Fire and Smoke Map | Export Map Image | Export Map Data
Show tabular data icon Reveal Tabular Data
Tabular data mirrors what is showing above. To hide columns, hide (x) parameters above.
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Additional Data

Explore these links to learn more about air quality data in parks and around the country.
Ozone air quality index good condition icon (green)
Good (0-54 ppb)
No cautionary statement.
Ozone air quality index moderate condition icon (yellow)
Moderate (55-70 ppb)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Ozone air quality index unhealthy-for-sensitive-groups condition icon (orange)
Unhealthy for Sensitive Groups (71-85 ppb)
Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy exertion outdoors.
Ozone air quality index unhealthy condition icon (red)
Unhealthy (86-105 ppb)
Active children and adults, and people with lung disease, such as asthma, should avoid prolonged or heavy exertion outdoors. Everyone else, especially children, should reduce prolonged or heavy exertion outdoors.
Ozone air quality index very-unhealthy condition icon (purple)
Very Unhealthy (106+ ppb)
Active children and adults, and people with lung disease, such as asthma, should avoid all outdoor exertion. Everyone else, especially children, should avoid prolonged or heavy exertion outdoors.
Learn more about the Air Quality Index »
Ozone Good
Good (0-50)
No cautionary statement.
Ozone Moderate
Moderate (51-100)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Ozone Unhealthy for Sensitive Groups
Unhealthy for Sensitive Groups (101-150)
Children, older adults, active people, and people with lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Ozone Unhealthy
Unhealthy (151-200)
Children, older adults, active people, and people with lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Ozone Very Unhealthy
Very Unhealthy (200+)
Children, older adults, active people, and people with lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
The NowCast is EPA's method for relating hourly data to the Air Quality Index (AQI). It is designed to be responsive to rapidly changing air quality conditions, such as during a wildfire. The NowCast displays air quality for the current hour by using a calculation that involves multiple hours of past data. The NowCast aligns more closely with what people are experiencing, allowing them to protect their health when air quality is poor and help them get outdoors when air quality is good. For ozone, the NowCast method uses the relationship between 1-hour and 8-hour ozone averages during the prior two weeks to predict an 8-hour ozone average that is centered on the current hour.
Learn more about the Air Quality Index »
Particulate matter (PM2.5) air quality index good condition icon (green)
Good (0 - 9 µg/m3)
No cautionary statement.
Particulate matter (PM2.5) air quality index moderate condition icon (yellow)
Moderate (9.1 - 35.4 µg/m3)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Particulate (PM2.5) matter air quality index unhealthy-for-sensitive-groups condition icon (orange)
Unhealthy for Sensitive Groups (35.5 - 55.4 µg/m3)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) air quality index unhealthy condition icon (red)
Unhealthy (55.5 - 125.4 µg/m3)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) air quality index very-unhealthy condition icon (purple)
Very Unhealthy (125.5 - 225.4 µg/m3)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) air quality index hazardous condition icon (maroon)
Hazardous (> 225.4 µg/m3)
Everyone should avoid all physical activity outdoors. Children, older adults, and people with heart or lung disease (such as asthma) should remain indoors and keep activity levels low. Follow tips for keeping particle levels low indoors.
The NowCast is EPA's method for relating hourly data to the Air Quality Index (AQI). It is designed to be responsive to rapidly changing air quality conditions, such as during a wildfire. The NowCast displays air quality for the current hour by using a calculation that involves multiple hours of past data. The NowCast aligns more closely with what people are experiencing, allowing them to protect their health when air quality is poor and help them get outdoors when air quality is good. For ozone, the NowCast method uses the relationship between 1-hour and 8-hour ozone averages during the prior two weeks to predict an 8-hour ozone average that is centered on the current hour.
Learn more about the Air Quality Index »
Particulate matter (PM2.5) Nowcast air quality index good condition icon (green)
Good (0 - 50)
No cautionary statement.
Particulate matter (PM2.5) Nowcast air quality index moderate condition icon (yellow)
Moderate (51-100)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) Nowcast air quality index unhealthy-for-sensitive-groups condition icon (orange)
Unhealthy for Sensitive Groups (101-150)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) Nowcast air quality index unhealthy condition icon (red)
Unhealthy (151-200)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) Nowcast air quality index very-unhealthy condition icon (purple)
Very Unhealthy (201-300)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) Nowcast air quality index hazardous condition icon (maroon)
Hazardous (301-500)
Everyone should avoid all physical activity outdoors. Children, older adults, and people with heart or lung disease (such as asthma) should remain indoors and keep activity levels low. Follow tips for keeping particle levels low indoors.
The NowCast is EPA's method for relating hourly data to the Air Quality Index (AQI). It is designed to be responsive to rapidly changing air quality conditions, such as during a wildfire. The NowCast displays air quality for the current hour by using a calculation that involves multiple hours of past data. The NowCast aligns more closely with what people are experiencing, allowing them to protect their health when air quality is poor and help them get outdoors when air quality is good. For particulate matter, the NowCast is based on the last 12 hours of particulate measurements, with heavier weighting on the most recent hours.
Learn more about the Air Quality Index »
Particulate matter (PM10) air quality index good condition icon (green)
Good (0 - 54.9 µg/m3)
No cautionary statement.
Particulate matter (PM10) air quality index moderate condition icon (yellow)
Moderate (55 - 154.9 µg/m3)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Particulate (PM10) matter air quality index unhealthy-for-sensitive-groups condition icon (orange)
Unhealthy for Sensitive Groups (155 - 254.9 µg/m3)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Particulate matter (PM10) air quality index unhealthy condition icon (red)
Unhealthy (255 - 354.9 µg/m3)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Particulate matter (PM10) air quality index very-unhealthy condition icon (purple)
Very Unhealthy (355 - 424.9 µg/m3)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
Particulate matter (PM10) air quality index hazardous condition icon (maroon)
Hazardous (> 425 µg/m3)
Everyone should avoid all physical activity outdoors. Children, older adults, and people with heart or lung disease (such as asthma) should remain indoors and keep activity levels low. Follow tips for keeping particle levels low indoors.
Learn more about the Air Quality Index »
Particulate matter (PM2.5) air quality index good condition icon (green)
Good (0 - 50)
No cautionary statement.
Particulate matter (PM2.5) air quality index moderate condition icon (yellow)
Moderate (51-100)
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) air quality index unhealthy-for-sensitive-groups condition icon (orange)
Unhealthy for Sensitive Groups (101-150)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should reduce prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) air quality index unhealthy condition icon (red)
Unhealthy (151-200)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid prolonged or heavy exertion outdoors. Everyone else should reduce prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) air quality index very-unhealthy condition icon (purple)
Very Unhealthy (201-300)
Children, older adults, active people, and people with heart or lung disease (such as asthma) should avoid all outdoor exertion. Everyone else should avoid prolonged or heavy exertion outdoors.
Particulate matter (PM2.5) air quality index hazardous condition icon (maroon)
Hazardous (301-500)
Everyone should avoid all physical activity outdoors. Children, older adults, and people with heart or lung disease (such as asthma) should remain indoors and keep activity levels low. Follow tips for keeping particle levels low indoors.
Learn more about the Air Quality Index »
Understanding 24-Hour Ground Level Smoke Forecasts »

Air quality and weather data are typically displayed on this web page within a hour of their collection. As a result, data quality is not guaranteed for scientific and regulatory purposes. These data may be revised at a later time.

Ozone

Ground-level ozone (O3) measured in parts per billion (ppb) forms near the Earth's surface when volatile organic compounds react with nitrogen oxide emissions in the presence of sunlight. This is different from the ozone layer in the upper atmosphere, which protects us from harmful ultraviolet radiation. Ground-level ozone can harm both humans and plants. Learn more about how ozone affects humans ». Learn more about how ozone affects plants ».

Particulate Matter

Particulate matter (PM2.5 and PM10) pollution includes wind-blown dust, smoke from burning fossil fuels, and smoke from forest and grassland fires. Particulate matter can affect humans and visibility. Learn more about how particulate matter affects humans ». Learn more about how particulate matter affects visibility ».

Visibility

Visual range is reported in miles (mi) or kilometers (km). It is defined as the greatest distance at which a large black object can be seen and recognized against the background sky. Visual range is calculated from measurements of light scattering and absorption by particles and gases.

Fine particles and gaseous air pollution affect how far and how clearly we can see to some degree in every national park. Learn more about how air pollution affects visibility ».

Weather

Information about local atmospheric conditions, including temperature, wind, humidity, and precipitation, can be important for understanding air quality.

Ground-level ozone (O3) measured in parts per billion (ppb) forms near the Earth's surface when volatile organic compounds react with nitrogen oxide emissions in the presence of sunlight. This is different from the ozone layer in the upper atmosphere, which protects us from harmful ultraviolet radiation. Ground-level ozone can harm both humans and plants. Learn more about how ozone affects humans ». Learn more about how ozone affects plants ».

Particulate matter (PM2.5 and PM10) pollution includes wind-blown dust, smoke from burning fossil fuels, and smoke from forest and grassland fires. Particulate matter can affect humans and visibility. Learn more about how particulate matter affects humans ». Learn more about how particulate matter affects visibility ».

The forecast shown here displays calculated 24-hour air quality index (AQI) values for particulate matter based on the NOAA High-Resolution Rapid Refresh Smoke (HRRR-Smoke) model. This model uses satellite data to determine fire emissions and a three-dimensional weather-smoke model to simulate smoke dispersion. The forecast AQI is based on the surface smoke variable. Each symbol on the map represents a grid point of the model output (3 kilometer resolution). The model is updated hourly, and the model start time is shown above the map. The calculated AQI is only for particulate matter from surface smoke. The model does not currently provide data on other particle types and may not be as protective as the overall AQI that considers other sources of particulate matter and ozone.
Learn more about the HRRR-Smoke Model »