Le Réseau National de Surveillance Aérobiologique (RNSA) website is a useful stop for hay fever sufferers as there are guides and regular updates available.
There are historical records for towns and cities across France enabling you to spot when pollen levels are at their highest.
And the levels of individual plants in towns and cities can also be checked, they can be found to the right hand side of the page, with an estimate of forthcoming pollen levels plotted on time graphs.
One feature of the RNSA website that could prove particularly useful is a weekly email service that allows you to choose up to three départements and get updates to your inbox about pollen level risks.
Related article: Air quality maps in France