Project news
Modifier 18 August 2020
by Clairo Project Team

Air quality data is now available online

Clairo data base
Clairo data base
From mid-June onwards, an online platform is displaying up-to-date air quality data (concentrations of atmospheric pollutants) for selected locations where greenery will be planted. Experts from Ostrava’s Technical University have created a publicly accessible geo-information system which shows real-time concentrations of pollutants.

The data from the measurement sensors is displayed using the Floreon geo-database – a platform created by the IT4Innovations National Supercomputing Centre to show a range of data in map form. You can view the database at the website airsens.eu in the section “Přístup pro veřejnost” (in Czech). The website displays a base map showing the sensor stations as coloured circles. The measured concentrations are displayed as numbers inside the circles – either in green (below-limit concentrations), yellow (above-limit concentrations) or red (concentrations triggering the imposition of temporary emissions limits). If you click on a particular measurement point (sensor station), graphs showing concentrations of all the measured substances are displayed at the right of the screen. You can jump to different measurement locations either using the map or via the tabs at the bottom of the page.

The Floreon platform shows concentrations of particulates (PM1, PM2.5 and PM10) as well as NO2, O3, volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAUs). Users can access data from 25 sensor stations; these are located not only at the planting locations in Ostrava, but also in Opava and Třinec, where pilot measurements are now underway.

The sensors capture data very rapidly; values are recorded every 10 seconds, and the accumulated data is uploaded to the database at 5-minute intervals. One day of measurement by 20 sensors, tracking the values of 8 airborne substances, produces more than 46 000 separate data values. Sensors are a modern and rapid method of measurement, but they do not conduct the type of reference measurements set out in air quality protection legislation. Although the sensors are very accurate (especially for PM10), their data cannot be used to monitor compliance with air pollutant limits. The data from the sensor stations is therefore used solely for the purposes of the Clairo project, which is monitoring changes in pollutant concentrations in relation to the ability of greenery to absorb airborne pollutants; the measured values are thus relevant only for a specific location, not for other parts of the city.

Data from the Floreon platform is archived and can be retrieved at any time. The data will be accessible for any time in the period from 1 September 2019 up to 2026.

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