1. Lessons learned from ozone thematic session 2016
Short presentations:
Augustin Colette: Current scientific knowledge and understanding about past and predicted future ozone trends
Frank Dentener: Contributions of the hemispheric transport of air pollution to ozone levels as well as local peaks
Marie-Eve Heroux: Impacts of ozone on health – indicator to be used in impact assessments
Harry Harmens: Impacts of ozone on ecosystems – indicator to be used in impact assessments
Isaura Rabago: Ozone issues specific to the Mediterranean in the current and future climate
Xavier Querol: The origin of the highest ozone episodes in Spain
Discussion: Ideas & priorities for future research agenda ( ) to support policy response to Assessment Report and upcoming mid-term review of the Long Term Strategy

2. Priorities for the future (1)
Long-term (>20 years), good quality ozone data required to assess trends
Understanding trends is necessary to understand LRT contributions - and the anthropogenic part of it.
Determine main driving forces for changes in ozone profile and trends
(e.g – 2000: Emission changes only explain % of ozone changes at baseline stations )
Determine trends and projections (including climate dependent receptor scenarios) in ozone exposure proxies and impacts
Europe: analyse changes of ozone concentration frequencies due to regional and extra-regional emission perturbations (HTAP 2)
Apply new regional tools to global models to gain new insights and learn from regional differences (e.g. TOAR data: present to CLRTAP)
Test if Ox (O3+NO2) can facilitate understanding of trends & attribution

3. Priorities for the future (2)
Vegetation: flux-based approach (allows incorporation CC & N interactions):
Identification of crops, ecosystems and regions/areas globally most vulnerable to ozone pollution and climate change (including extreme events); impacts on biodiversity
Collate evidence; need for experiments with current O3 profile;
Inform agricultural community (primarily interested in soil moisture and N impacts) of ozone impacts on crop yield
Mediterranean: apply Med.-specific flux-effects relationships and model parameterisation in risk assessments (e.g. EMEP model)
Effect soil moisture important
EMEP/WGE working group to assess feasibility and scope
Health: New indicator required for chronic ozone impacts: SOMO10 or continue with SOMO35? Evidence needed to support indicator.

4. Additional comments
Can we do more in Europe to mitigate ozone concentrations and impacts?
Yes, but comes at a cost
What can we learn more from past data to improve predictions in the future (e.g. Eurodelta trend analysis)?
Translate concentration/deposition trends into impacts, and for both assess % contribution from local pollution and from baseline/LRT.
Imbalance in progress made with LRT modelling and data we have for impacts for current ozone profile (many impacts data from 1980s/90s which high ozone peaks, not enough data on impacts of rising baseline concentration).
Don’t forget: ozone impacts on vegetation feed back to the climate and surface ozone concentrations