Slider Test Urban Data – at your fingertips Data sketching algorithms with the Sustain project allow us to separate information from the data. This facilitates coping with voluminous data. US Census Data Data from the US Census Survey now available within Sustain. The data covers several features at the block-level for the past 4 decades. Air Quality Dataset Air quality data from the Environmental Protection Agency now available within sustain. This includes data collected at hourly intervals from monitoring locations in the United States from 1980. National Land Cover Database The National Land Cover Database for the conterminous United States now available within Sustain. The NLCD from USGS represents land cover as 16 thematic classes.