Air Quality Reports for Ohio's Cities
These reports contain pollution data, in hourly averages tabular form, measured across the state during the previous day. They present the data in "RAW" form, meaning that the data you see are exactly what was collected electronically from each pollution monitor several times during each day. Please see our Note and Disclaimer below.
Please select from the following Reports:
- Highest Hourly-Averages Report - This report is a listing of the HIGHEST hourly average reading recorded during the previous day for each of these parameters: CO, SO2, O3, PM10 and NO2, as measured at monitoring sites operated by the Ohio EPA.
- OhioEPA data Report - This report is a listing of ALL 24 hourly average readings recorded during the previous day, for ALL parameters, as measured at monitoring sites operated by the Ohio EPA.
- OhioEPA and LAA data Report - This report is a listing of ALL 24 hourly average readings recorded during the previous day, for ALL parameters, as measured at monitoring sites operated by the Ohio EPA and Local Air Agencies in Ohio.
- X-Section Report - This report is a listing of ALL 24-hourly average readings recorded during the previous day, organized by parameter, showing all Ohio EPA monitoring sites which measure that parameter. This report also includes a rolling Minimum, Maximum, and Mean value for each hour, calculated from all applicable monitoring sites under each parameter.
- Ozone: 8-Hour Rolling Average Report
Each of the options above will access reports of pollution data measured across the state during the previous day. These reports present the data in "RAW" form, meaning that the data you see are exactly what was collected electronically from each pollution monitor several times during each day. It is important to remember that "RAW" data are never considered valid until verified by Ohio EPA and Local Air Agency personnel, a process that can take much more time than the nearly immediate data availability on this website. Thus, data seen here may not necessarily be "FINAL" data. Please bear in mind that what you see in these reports will not always be 100% accurate!
Some readings will include letters or numbers in place of or after the data value, called "FLAGS." These flags indicate that something other than normal sampling occurred during that hour, such as monitor maintenance or calibration, daily diagnostic tests, performance audits, monitor malfunction, etc. Hourly readings with "...." instead of a number indicate that there was no data available for that hour, usually due to monitor malfunction or a problem in communication between the monitoring site and the central computer system which retrieves the data.
All of the reports available in this section present data from several types of air pollution and meteorological monitors. These monitors continuously sample the air to detect levels of air pollutants harmful to public health and welfare. The data collected by the monitors is then used to assess each area's compliance with the "National Ambient Air Quality Standards," or NAAQS, which are maximum acceptable levels of each pollutant as designated by the U.S. EPA. Some of the pollutant and meteorological names, or "PARAMETER," along with the most common unit of measurement, or "UNIT," for each, are:
| Parameter | Unit |
| Carbon Monoxide (CO) | PPM (parts per million) |
| Sulfur Dioxide (SO2) | PPB (parts per billion) |
| Ozone (O3) | PPB(parts per billion) |
| Nitrogen Dioxide (NO2) | PPB (parts per billion) |
| Particulate Matter (PM10) | UG/M3 (micrograms/cubic meter) |
| Temperature[indoor or outdoor] (TEMP) | DEG. F, (degrees Fahrenheit,
DEG. C, (degrees Celsius),
KLVIN (degrees Kelvin) |
| Wind Speed (WSPD) | MPH (miles per hour) |
| Wind Direction (WDIR) | DGREE (compass degrees) |
| Barometric Pressure (AMPSI) | MM/HG (millimeters of mercury) |
| Solar Radiation (SOLAR) | W/M2 (watts per square meter) |
Note: Data in these reports are always referenced to Eastern Standard Time (EST). Air Quality Index reports are updated several times during a day at 15 minutes past the hour ( 8A.M. - 10 P.M. EDT)
Disclaimer: The data in these reports have neither been validated nor quality assured by State or LAA Air Monitoring Agencies. These data may change and are not considered official until QA/QCed -- odd data are suspect invalid due to possible equipment trouble or telemetry problems.
Groups sensitive to the effects of air pollution:
- Particle Pollution - People with heart or lung disease (such as asthma), older adults, and children.
- Ground-level Ozone - People with lung disease (such as Asthma), and children and adults who are active outdoors.
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