1. CHIMERE Workshop 2005 Local air pollution forecast over the Rhône-Alpes French region: focus on Lyon and Grenoble areas Florence Troude Prevision / Modelisation / Emission GIERSA COPARLY = Lyon local air quality agency ASCOPARG = Grenoble local air quality agency

2. CHIMERE Workshop 2005 Lyon - Grenoble Lyon : at the junction of the Rhone and Saone Rivers relatively flat topography (z<500 m ASL) Grenoble : located in a Y-shaped convergence of three deep valleys with surrounding mountains as high as 3000 m ASL mountainous region & complex topography

3. CHIMERE Workshop 2005 Lyon operational O 3 & NO 2 hourly prevision Relatively flat topography old CHIMERE version (V2001) backward trajectories, flat terrain homogeneous horizontal meteorology Windows and linux OS 160 km x 120 km centered on Lyon horizontal resolution : 4 x 4 km² LYON

4. CHIMERE Workshop 2005 Lyon: outcome of 3-years-use of V2001 CHIMERE model linear correlation forecast / measured [O 3 ] errors

5. CHIMERE Workshop 2005 Lyon operational O 3 & NO 2 hourly prevision relatively good alert forecast but too many false alert overestimation of [O 3 ] : ~ 5-10 µg.m -3 bad results for NO 2 not completely obsolete

6. CHIMERE Workshop 2005 Lyon operational O 3 & NO 2 hourly prevision NCEP - MM5 – CHIMERE (V200310G, linux OS ) installed in 2004 – ACRI ST stand by for new emission cadastre Domain, resolution: – 160 km x 120 km - 4 x 4 km² = old chimere version evaluation of the impact – project : extension of the domain (including Bourgoin- Jallieu) and higher resolution (2 x 2 km² ?)

7. CHIMERE Workshop 2005 Grenoble operational O 3 & NO 2 hourly prevision Mountainous region & complex topography complex wind pattern 3D meteorology required Systems (linux OS) : NCEP - MM5 – CHIMERE and NCEP - MM5 - METPHOMOD (c.f. Eric Chaxel next presentation) Validation on summer 2003 and the next summer 2005 G

8. CHIMERE Workshop 2005 CHIMERE output expected From our local point of view, the models performance should give us : hourly prevision of concentration from D to D+2 of O 3, NO 2, and dust