The basis to determine locations for measuring urban air quality in Germany is the 39th Ordinance to Implement the Federal Immission Control Act (39th BImSchV). This is a federal law on air quality and clean air for Europe, based on European Directive 2008/50/EC of the European Parliament and the Council on 21 May 2008.
The regulations aim to ensure that the chosen premises allow these expensive measuring stations to capture a representative picture of the air quality. With the advocate towards our cost-effective sensors from leading international environmental agencies, quick acceptance is expected to get.
More specifically, the regulations based on many important factors influencing the representativeness of an air quality measurement, which should also be considered when using sensors:
- Representativeness: As a basic principle, the locations chosen as measurement facilities should represent a larger urban area – and thus a greater population exposure.
- Airflow guide: The airflow around the measuring device must not be impaired (the regulation prescribes a free radius of 270 ° for this purpose). A distance of at least 0.5 meters must exist between nearby buildings, trees, and other obstacles.
- Measurement altitude: The actual measured air must be taken at a height of 1.5 meters (the universal breathing zone among all ages) up to a maximum of 4 meters for the measurement. In exceptional cases, air quality values can be recorded at a height of up to 8 meters.
- Noise immunity: Measurements should not be made in the immediate vicinity of emission sources. This could prevent emissions from mixing into the ambient air.
- Exhaust air duct: Re-entry of the exhaust air for re-measurement must be avoided.
- Traffic-related measurements: There must be a distance of at least 25 meters from the edge of busy intersections. The measuring station may not be more than 10 meters from the edge of the road.
- Other factors: sources of interference, safety, accessibility, power supply (and data link), visibility of the monitoring station in the area, the safety of the public and operating personnel, advantages of merging the sampling points for different pollutants, requirements of urban land use planning.
Types of air quality measurement sites
The purpose of the 39th BImSchV is to determine the maximum levels of pollutants as well as the average urban air quality. To achieve this, air quality data must first be recorded at locations where the highest pollutant concentrations are expected to be. Moreover, a representative picture of the average pollutant concentration within the observation area has to be created with other locations.
The sensors require a constant power supply. As a result, either a suitable voltage source can be set up outdoors, or an internal power source can be used, for example, with a flat cable laid through a window.
In addition, the uninterrupted transmission of air quality measurement data must be guaranteed. Depending on the transmission technology, it may also affect the location (e.g., cellular signal strength or visibility of a LoRa gateway).
It is our pleasure to discuss with you about a measuring location in your area. Please do not hesitate to contact us in order to get a representative picture of our air: https://www.breeze-technologies.de/.
Read this article in German here.