IDEM Continuous Air Quality Monitoring

Data by Month by Site by Parameter
Use this form to retrieve monthly summaries of hourly average data collected at some IDEM continuous air monitoring stations. Although this is our most current data, it is not considered official until it has been certified by our technical staff. This information is updated hourly.

This web page provides the most current hourly averaged data available. Our convention for time-tagging data is the beginning of each hour. For example, values shown for the noon hour are based on measurements take from noon to 1:00 p.m.. The noon average will not be calculated until after 1:00 p.m.. The noon average will be then be available on our external server after 1:30 p.m.. This results in an apparent one hour time lag in the data. We also present our data in Local Standard Time for each measuring site. For most of Indiana this is Eastern Standard Time. During Daylight Savings, this introduces another apparent one hour time lag in the data.

Select a monitoring site:

View monthly summaries of the hourly averages for all the pollutants and meteorological conditions measured by the IDEM at your selected monitoring site. Select the monitoring site you are interested in from the list below. Please note that not all parameters are measured at all sites

Always select the CAMS you want before setting any options below (selecting a new CAMS forces this web page to refresh and reset to the previously stored options).

Select a monitoring site:

Please select a CAMS from the list above.