Clean Air Status and Trends Network (CASTNET): Visibility

Dataset Summary

Agency:	Environmental Protection Agency
Sub-Agency:
Category:	Geography and Environment
Date Released:	10/1/1993
Date Updated:	6/30/2002
Time Period:	10/1993 - 6/2002
Frequency:	Hourly
Description:	Nephelometer data (conforms to IMPROVE network standards) from October 1993 to June 2002. This table is no longer updated.

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Dataset Information

Data.gov Data Category Type	Raw Data Catalog
Specialized Data Category Designation	Administrative
Keywords	Visibility, Air Quality, Air Pollution, EPA, federal data download, public health, environment, nephelometer, visibility, clean air trends, CASTNET, federal datasets, ambient, particles, acid rain, dry deposition, so2, hno3, nitric acid, ozone, monitoring, ambient concentrations
Unique ID	9

Contributing Agency Information

Citation	CASTNET nephelometer data (visibility)
Agency Program Page	CASTNET
Agency Data Series Page	http://www.epa.gov/castnet/data.html

Dataset Coverage

Unit of Analysis	An air quality sampling station
Granularity	Coordinate Pair (latitude / longitude)
Geographic Coverage	United States

Data Description

Collection Mode	Other
Data Collection Instrument	http://www.epa.gov/castnet/docs.html
Data Dictionary/Variable List	Included with data download

Additional Dataset Documentation

Technical Documentation	http://www.epa.gov/castnet/docs.html
Additional Metadata	Included with data download

OMB Control No. 3090-0284