Use the Earth System Research Laboratory (ESRL) Global Monitoring Division site to find specific atmospheric data files. You can also browse the GMD ftp server. Navigate through the criteria to narrow your selection of data.
For example, click on Greenhouse Gases as your main category, and then choose Carbon Dioxide as the type of greenhouse gas. From there you select how the air sample was collected, such as air samples collected in glass flasks, and how frequently the samples were collected (e.g. monthly). Your results then display specific locations around the world that meet these requirements.
Note: These links go to pages that contain raw data. You need to copy and paste the data into Excel.
The United Nations Statistics Division (known as UNSTATS) produces data sets on a variety of topics.
Note: These files downloads in Excel file, but may be zipped due to the quantity of info it .
Use the International Energy Database to locate data sets on world-wide carbon emissions from various sources.
Use the Earth System Research Laboratory (ESRL) Global Monitoring Division site to find ozone data files. Navigate through the criteria to narrow your selection of data.
Hourly Surface Ozone Averages
The Climatological Data Annual Summaries include specific state data for total precipitation & departure from normal, average temperatures & departure from normal, temperature extremes & freeze data, monthly & seasonal cooling degree days, soil temperatures, pan evaporation & wind movement, & station index. The data come from NOAA's National Climatic Data Center (NCDC) and the NOAA Regional Climate Centers.
Daily data for individual sites is available for precipitation, high temperature & low temperature.
Note: These data sets are in PDF format, so you will need to copy & paste the data into Excel.
For local atmospheric data, the NOAA National Data Center (NNDC) Climate Data Online database is more involved, but very rich with data. You can select data for a weather station or multiple stations for time periods you select. It covers precipitation, maximum temperature, minimum temperature, snowfall, snow depth, and more (data from each station varies).
Click here for directions.