CWED Comprises approximately 480,000 exposure observations. Each observation represents a single occupational exposure measurement and contains (typically) the following data:
- Exposure concentration (ppm)
- Substance
- Industry (NAICS)
- Occupation (NOCS)
- Sampling Method
- Duration
- Location
- Date
CWED contains data from 1953 through 2012, but 95% of the data represents measurements taken between 1981-1998.
Three hundred and fifty substances are represented in the CWED. The major contributors (with > 4000 obs) are:
The distribution of data held by region is:
