Skip to content. | Skip to navigation

Personal tools
You are here: GES DISC Home Featured Items Giovanni Air Quality Instance Now Available

Giovanni Air Quality Instance Now Available

A new Giovanni instance dedicated to air quality related data is now available. The instance includes global aerosol and cloud data from MODIS, global aerosol data from OMI, and the AIRNow Fine Particulate Matter (PM2.5) ground-based monitoring product for the continental United States.

Giovanni Air Quality Instance Now Available

The GES DISC has created the Giovanni Air Quality Instance for visualization and exploration of remotely- sensed and in situ data products related to air quality. For the continental United States, the Air Quality instance features Environmental Protection Agency AIRNow PM2.5 data from ground-based monitoring stations. PM2.5 is also known as Fine Particulate Matter, and it indicates the concentration of aerosol particles less than 2.5 μm in diameter. PM2.5 is a pollutant because particles of this size can lodge deep in human lungs and cause health problems, such as asthma, emphysema, respiratory difficulty, and chronic bronchitis. The PM2.5 product is provided by the cross-agency AIRNow program.

 

 

 

An image of the PM2.5 data product for the New England region on August 25, 2007.  Elevated concentrations are visible over southern New York State, western Massachusetts, and southern Vermont. 

Click image for larger version.

   
Fine Particulate Matter (PM 2.5) over New England, August 25, 2007

 

In addition to the PM2.5 data product, the Air Quality Instance also includes aerosol and cloud data products from the Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra and Aqua satellites, and aerosol products from the Ozone Monitoring Instrument (OMI) on the Aura satellite.   Unlike the PM2.5 data product, all of the remotely-sensed data products are available globally.

The Giovanni system provides several different rapid visualization and analysis capabilities that can be utilized to examine the data in the Air Quality instance.   Users can generate maps of specific data products, time-series, and Hovm√∂ller plots.    Multiple data products can be plotted in the same time-series.   Users can also create maps of the correlations between different data products, which indicate if these data products are related to each other over a specific time interval. 

 

 

 

Correlation map:  PM2.5 and MODIS Aerosol Optical Depth during July 2007, showing high correlations between these two data products.  Many of the high-correlation areas in this image could be related to smoke from summer wildfires.

Correlation map, PM2.5 and MODIS Aerosol Optical Depth, July 2007, California and Pacific Northwest

Shown below are other types of events that influence air quality.   The "Haze" custom color palette was used to show how Giovanni has considerable flexibility in its visualization menu, providing an easy way to prepare graphics for presentations and research papers.  Click on each image to view it full-size.

Vog ("volcanic smog")  
MODIS true-color image of volcanic haze over the Hawaiian Islands, April 26, 2008

Giovanni visualization of MODIS Aerosol Optical Depth data on April 26, 2008.,

MODIS true-color image of volcanic haze over Hawaiian Islands

MODIS true-color image of volcanic haze over Hawaiian Islands

   
Southern California Wildfires, October 2003  
MODIS image of Southern California wildfires on October 26, 2003.
Giovanni visualization of PM2.5 data product for California in October 2003.
MODIS image of smoke and fire location, October 26, 2003 Fine Particulate Matter (PM2.5) over California, October 2003
   
Saharan Dust Storm over the Atlantic  
MODIS image of a dust storm over the Atlantic Ocean, March 4, 2004
Giovanni visualization of MODIS Aerosol Optical Depth data for this dust storm.
MODIS true-color image of dust storm over the Atlantic Ocean March 4, 2004 Giovanni visualization of MODIS Aerosol Optical Depth data for the dust storm, March 2-6, 2004

Go to the Giovanni Air Quality Instance

Document Actions
NASA Logo - nasa.gov
NASA Privacy Policy and Important Notices
Last updated: Mar 06, 2014 10:29 AM ET
Top