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| CHARACTERISTICS AND FORMS OF THE URBAN CLIMATE |  |
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 2.9.1 Limits and Assessment values |
The immission threshold values outlined in the “Technical Instructions on Air Quality Contral (TA Luft)” (see table 2/5) serve for the air-hygienic evaluation of industrial facilities (new or altered) that require permitting. Distinguished are in the process three values depending on the relevant pollutant: The arithmetic annual average of the immission values, the arithmetic daily average of the immission values and the short-term value refers to 99,8% of the cumulative frequency distribution.
The compliance with the regulation is the requirement for the permission of an industrial facility. The evidence is offered by comparing imission values with the sum of incriminating background and additional pollution caused by the planned industrial facility. The incriminating background is determined by an stipulatory procedure (TA Luft).
The TA Luft values are not a legal planning instrument; they define rather the legal concept of "damaging environmental effect." In partitions analogical with the 39 nd BImSchV"s limit values. These are of great importance because the need of measurements directly in the street canyon. It seems likely to exceed the limit values in much frequented areas.
The 39 nd BImSchV is based on the Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe (EU 2008/50/EG). When the limit values are exceeded, clean air plans need to be drawn up, which allow for the implementation of traffic guidance and/or traffic restriction measures in order to reduce negative environmental impacts caused by the pollutants (Stuttgart "s Regional Administrative Authority/ Regierungspräsidium Stuttgart , 2005 and 2010). The limit values for NO2 and particulate matter (PM10) are and will be exceeded in numerous heavily frequented urban canyons.
This means that the impact of roads must be thoroughly analysed and taken into account in future urban land use planning, and this not only in the context of noise implications but also in regard to pollutant levels.
The World Health Organization (WHO, 2011)has released health-related indicator values.The definition of "maximum immissions values" (MI values) (VDI Regulation 2310) from the VDI commission "Air Quality Maintenance" aims at avoiding damage, whether short- or long-term, to the health of humans, especially children, the elderly, and the sick, and further aims at protecting animals, plants, and goods from harm. The concept of "health" also includes the well being of a human, to which one"s biological and material environment contributes. The MI values are concerned with purely effect-related, scientifically established values guided by practical experience and with a medical or natural science indication. The values do not take into account technical practicability.
Pollutant
| Immission
values
"TA Luft" | MIK-
values
VDI 2310 | Conductance
WHO | Limit and
target value
39. BImSchV | Guidelines
german bath association | | SO2 | I1 | | | I2 | | | 24 h | | | 1 h | | | 1/2 h | | | 10 min | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Table 2/5: Limits and guidelines in µg/m³ with exlanation | | I1: | arithmetical annual mean value | | I2: | 98- Percentil during 1 year | | b | depending from location; I2-values as a 14 days mean | | c | 18 exceedings are allowed in the year | | d | only for 2 successive values | | e | on successive days | | f | total dust | | i | allowed 35 excceedings per year | | k | 180: limit value to inform the population
240: limit value to warn the population | | l | allowed 24 excceedings per year | | m | allowed 3 excceedings per year | | n | target value to 01/01/2015 | | o | allowed 25 days excceedings per year | Download: Table - Limits and guidelines (2012) (pdf)
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