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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 This table is no longer updated.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 Metrics

Number of Downloads

833

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