This map shows the latest MACC air quality forecast for the UK using the UK Daily Air Quality Index (DAQI). This index is a 1-10 scale divided into four bands: LOW (1, 2, 3), MODERATE (4, 5, 6), HIGH (7, 8, 9), VERY HIGH (10). The DAQI scale is defined by the UK government who provide accompanying health advice.
The map shows pollution from four individual pollutants (nitrogen dioxide, ozone, and particulates PM10 and PM2.5) and an overall value, which is the highest DAQI value from any pollutant. Forecasts are available for four days ahead. The maps are updated every morning as new forecasts are issued by MACC. The forecast for the fourth day is normally available on the map by 11:00 UK time each day; before this time the map will show 'No Data'.
The MACC forecasts give a good indication of expected pollution levels across the UK over the coming days. However, they do not capture local variation in pollution such as high levels close to busy roads, because each point on the map represents average levels over a 12km square. By contrast, the airTEXT forecast for London does capture these local variations because it uses the ADMS-Urban dispersion system to explicitly represent approximately 30,000 roads and other sources of pollution.
The UK MACC forecasts shown here are taken from the MACC Regional Ensemble system, which gives forecasts at 12km resolution on a domain covering the whole of Europe. The Ensemble forecast is the median of the forecasts from 7 different state-of-the-art atmospheric modelling systems from institutions across Europe, which all use the same emissions data, the same weather forecast data and the same boundary conditions (from the MACC Global forecast system) and combine these with Earth observation data to provide air quality forecasts.
MACC is an EU-funded collaborative project coordinated by the European Centre for Medium-Range Weather Forecasts (ECMWF) and operated by a consortium of 36 members from 13 countries. Data from MACC is freely available for anyone to use. CERC is a partner in the part of the MACC project that focuses on interaction between MACC services and their users. During the autumn of 2015 there will be a smooth transition from the MACC project to the EU’s fully operational Copernicus Atmosphere Monitoring Service (CAMS), which has secured funding until at least 2020.
Further information is available from the following external links: