Beyond Covid-19 Dashboard

APCG GroupThe Air Quality measurements are conducted at the urban-background “Air Pollution Monitoring Station” of the Institute for Environmental Research and Sustainable Development (IERSD/NOA)> at Thissio, central Athens.
The station is operated by the Atmospheric Chemistry and Physics Group (APCG) which acknowledges the H2020 SMURBS/ERA-PLANET project.
For further information please contact Dr. Evangelos Gerasopoulos ( and Dr. Eleni Liakakou (

  1. Two key dates for COVID-19 measures should be considered. March 15th as the start of the first mitigation guides and March 23rd as the date of the general lockdown. For the calculation of percentage changes, we use the first date. Changes are calculated in relation to i) the average concentration measured since the beginning of the year, ii) the average concentrations during February.
  2. The PM2.5 measurements are conducted with optical particle counting/sizing instruments, calibrated using a reference-equivalent monitor. In case of dust transport events, reported concentrations may significantly deviate from actual ambient concentrations.
  3. To evaluate the temporal variability of concentrations in association with the adopted “lockdown” measures, climatological and meteorological factors should also be taken into consideration.
  4. The user assumes the entire risk related to its use of this data. APCG/NOA is providing this data "as is" and disclaims any and all warranties, whether express or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will APCG/NOA be liable to you or to any third party for any direct, indirect, incidental, consequential, special or exemplary damages or lost profit resulting from any use or misuse of this data.

Nitrogen oxides (NOx) are reactive gases, which in cities are emitted mainly from vehicular traffic. Average NOx reduction by 45-50%.

Carbon monoxide (CO) is a gas emitted due to incomplete fuel combustion (e.g. from vehicular traffic and biomass-burning). Average CO reduction by 30-40%.

Black carbon (BC) is an aerosol product of incomplete fuel combustion emitted mainly from vehicular traffic and residential biomass-burning. Average BC reduction by 30-40%.

PM2.5 are fine suspended particles directly emitted (e.g. vehicular traffic, residential heating, power production) or secondarily formed and processed in the atmosphere. Average PM2.5 reduction by 10-20%.

Carbon dioxide (CO2) is the most important greenhouse gas. Increases from the global background levels are related to anthropogenic activities (i.e. fuel combustion). Average CO2 reduction 1-2%.