ROMO
U.S. Department of the Interior
National Park Service
Access to Gaseous Pollutant and Meteorological Data
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Data Export - Validated Data    
Data files in Comma Delimited Format (CSV) are available here. Two file formats are available:
1) Date/times in rows and sites/parameters in columns.
2) NEW as of 9/20/2016 - Sites/dates/parameters in rows and hours in columns (hourly data only)
Please note that you must allow Pop-ups to sucessfully use this feature.
If your query results in more than 65,536 rows the download file will be compressed.
Queries resulting in more than 300,000 rows are not allowed. For large data requests, please contact us.

Select start and end dates then click the continue button. The earliest date is January 1980.

Output Format:

Start Date: End Date: