2 datasets
  • National Ambient Air Pollutant Concentrations by Type of Pollutant: 1990 to 2005

    Free Download — The Statistical Abstract files are distributed by the US Census Department as Microsoft Excel files. These files have data mixed with notes and references, multiple tables per sheet, and, worst of all, the table headers are not easily matched to their rows and columns. A few files had extraneous characters in the title. These were corrected to be consistent. A few files ...
  • Clean Air Status and Trends Network (CASTNET)

    Offsite — Nephelometer data (conforms to IMPROVE network standards) from October 1993 to June 2002. This table is no longer updated. Additional facts from data.gov Dataset Summary Date Released: 10/1/1993 Date Updated: 6/30/2002 Time Period: 10/1993 – 6/2002 Data.gov Data Category Type: Raw Data Catalog Frequency: Hourly Specialized Data Category Designation: Administrative ...