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# air_quality_index_schaefer {#aqi-schaefer}
This method provides a single indicator (called the Air Quality Index (AQI)) for the assessment of air quality. The AQI can take values between 0 and 1, with 1 indicating that the allowable limits defined by ICAO are reached by all species. Therefore, low values are preferable.
## General principles {#aqi-schaefer-generalprinciples}
The calculation method, including all required inputs, is described in Schaefer (2017) \cite Sch17. It is:
$ AQI = 1/n \cdot \sum x_i/x_{i,max}$
where:
- $ x_i $: emission mass [g] ( for CO, HC, NOx) or maximum concentration [mg/m^3] ( for soot) during the landing and takeoff cycle,
- $ x_{i,max}$: regulatory value defined by ICAO, the ratio of emission mass Dp [g] emitted during LTO and the rated thrust F00 [kN],
- $ n $: number of emission species.
## Input-Data {#aqi-schaefer-input}
Only engine and emission data are needed. To construct the engine object, the following is required from acXML:
```xml
<engine description="Description of engine">
<engine_model description="Name of selected engine model">
<value>V2527-A5</value>
</engine_model>
<scale_factor description="Scale factor">
<value>1.168175939</value>
<unit>1</unit>
<lower_boundary>0</lower_boundary>
<upper_boundary>5</upper_boundary>
</scale_factor>
</engine>
```
From `ecological_assessment_results` following parameter will be read:
```xml
<calculation_results description="Results of calculation method">
<mission_emissions description="Results of mission emission calculation">
<study_mission description="Results of study mission calculation">
<emissions description="Emissions of study mission">
<LTO_cycle description="Emissions of landing and takeoff cycle">
<HC description="LTO HC emissions of one study mission">
<value>0</value>
<unit>kg</unit>
<lower_boundary>-1.797693135e+308</lower_boundary>
<upper_boundary>1.797693135e+308</upper_boundary>
</HC>
<CO description="LTO CO emissions of one study mission">
<value>0</value>
<unit>kg</unit>
<lower_boundary>-1.797693135e+308</lower_boundary>
<upper_boundary>1.797693135e+308</upper_boundary>
</CO>
<NOx description="LTO NOx emissions of one study mission">
<value>0</value>
<unit>kg</unit>
<lower_boundary>-1.797693135e+308</lower_boundary>
<upper_boundary>1.797693135e+308</upper_boundary>
</NOx>
<c_soot_LTO_max description="Maximum soot concentration during study mission LTO">
<value>0</value>
<unit>1</unit>
<lower_boundary>-1.797693135e+308</lower_boundary>
<upper_boundary>1.797693135e+308</upper_boundary>
</c_soot_LTO_max>
</LTO_cycle>
</emissions>
</study_mission>
</mission_emissions>
</calculation_results>
```
## Output-Data {#aqi-schaefer-output}
The submodule writes its calculation results into the HTML report located in `aircraft_exchange_file_directory/reporting/reportHTML`.
\ No newline at end of file