In response to the most common queries and requests received, we have prepared a frequently asked questions and further guidance page to help businesses to carry out air quality assessments.
1. What model should be used in an assessment?
No model is favoured or prescribed. The model chosen must be fit for purpose, based on established scientific principles, validated and independently reviewed. The full technical specifications, validation and review documents must be readily available. See our policy on model choice.
2. What conversion ratio should I use for NOx/NO2?
Use a risk based approach, see the document below:
3. Should detailed modelling be included in all applications?
You need to use a risk based approach to your modelling. The modelling must be robust and fit for purpose. All assumptions must be justified. The approach taken and its content should be proportional to the environmental risk caused by the proposed emission to air.
4. How many years of met data should be used for modelling?
Five consecutive years of met data is recommended, modelled separately to give a range of predictions.
5. What tools are available to help operators carry out their assessments?
6. What criteria should I compare my air quality against?
Our consultation on the revised H1 Environmental Risk Assessment guidance closed on 23 December 2009. You can view the consultation documents here:
7. How does the Environment Agency assess the impact of Group 3 metals from Municipal Waste Incinerators?
Please read the document below for information on this:
