Our Solutions
to Your Requirements

We provide a range of comprehensive services to meet the client’s requirement of preparing an
appropriate air quality assessment report to accompany the planning application. We offer the
following types of Air Quality Assessments (AQAs).

Viridian Air conducts air quality impact assessments of a wide range of developments from small residential schemes in or near Air Quality Management Areas, to major mixed-use schemes. The assessments can be standalone reports or form part of an Environmental Impact Assessment. Air Quality Impact and Residential Suitability assessments are essential to demonstrate that proposed developments meet the National Air Quality Objectives.

We follow the Defra Technical Guidance in carrying out air quality assessments. This includes establishing the baseline air quality using the air quality monitoring data from local authority’s precision and diffusion tube networks, and Defra’s background air quality maps (for current and future years). Relevant local and national planning and air quality policies are taken into consideration in developing the scope and methodology of the assessment.

Detailed AQA including Dispersion Modelling

Detailed air quality dispersion modelling, if required, is carried out to model traffic and dispersion of emissions for the base year, the business-as-usual (without the scheme) future year (when the development is expected to be in the operations phase) and the future year with the scheme. This is to check if the predicted air quality concentrations meet the National Air Quality Objectives and Air Quality Neutrality Assessment. In London, an AQA must demonstrate air quality neutrality and residential suitability in case of residential developments.

Mitigation Plan
A sound mitigation plan is developed (for both Basic and Detailed AQA) in consultation with the client for control of construction dust and to minimise exposure of sensitive receptors to air pollution concentrations. This is essential to meet the National Ambient Air Quality Objectives and to minimise health and ecological risks to sensitive receptors.

We conduct air quality dust risk assessment (AQDRA) during demolition, construction and trackout phases of the development. Dust risk assessments are based on the IAQM’s Guidance on the “Assessment of Mineral Dust Impacts for Planning”. Dust assessments are generally risk based, taking into account the magnitude of emissions, sensitivity of the area to health and ecological risk. GIS maps showing all ecological and human sensitive receptors within buffers of 20m, 50m, 100m, 200m, 350m and 500m are prepared to determine the sensitivity of receptors to health and nuisance risk.

We develop emission management or mitigation plan for control of dust emissions during demolition, construction and trackout phases to minimise health and ecological risks depending on the dust risk assessment.

We develop operation stage emission mitigation plan to minimise exposure of sensitive receptors to air pollution concentrations due to the development under consideration. A sound emission mitigation plan is even more important if the development is near or within an Air Quality Management Area (AQMA). We work with the client and follow the IAQM/local authority guidelines to develop an effective mitigation plan.

We investigate the air quality neutrality of the development in terms of the building (mainly energy) emissions as well as the transport emissions (due to the new trips generated by the development).


We offer most competitive prices for all types of Air Quality Assessments (AQA) ranging from a basic AQA to a detailed AQA. Please call or write to us to discuss your requirements and get an appropriate quote.

From project inception to finish, Viridian Air liaises closely with both the client and local authority officers in order to determine the assessment requirements, enabling a fast turnaround of reports that adhere to best practice guidance.

Our Credentials

The Viridian Air team is highly skilled with professional qualifications in environmental sciences and engineering, and information management. Its members are affiliated with the Institute of Air Quality Management (IAQM) and the Institute of Environmental Sciences (IES). Our team includes a Fellow of the IAQM, a Fellow of the Royal Meteorological Society, a Chartered Environmentalist and a Chartered Scientist. Collectively we have academic, research and practical backgrounds and will be able to deal with the consultancy requests of varied nature.

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