Although the daily forecast index has evolved since December 21, the first indexes for 2021, on January 1 and 2, showed correct air quality, from good to average, throughout the region and quite average in the Rhone.
Last year, at the same time, the air quality was bad and the Lyon basin had been put on orange watch, which led to the implementation of differentiated traffic measures, on January 1, 2020 at 5 a.m.
A few hours earlier, on December 31, 2019, the EPZ had just been installed. The most polluting utility vehicles and heavy vehicles (Crit’air 4 and 5) had been banned within the perimeter, under penalty of fines. From January 1, 2021, the measure is extended to professional vehicles equipped with Crit’air 3.
This Sunday, January 3, with the gradual return of a calmer and colder climate, the concentrations of particles will gradually increase, however, the air quality must remain generally average throughout the territory. It could degrade in some places.
There are 6 new Atmo indices, with new colors: Good, Medium, Gradient, Bad, Very Bad, Extremely Bad.
These new Atmo indices now integrate forecasts into daily models that integrate data measured at stations, sources of pollution, and weather.
This new calculation method is consistent with the European index by using the same thresholds, the same pollutants and the same communication codes (qualifiers, colors and sanitary recommendations).
More serious, it should lead to a significant increase in the number of pollution days per year.
This Monday, the index should deteriorate and turn yellow in the Lyon area up to Givors and in the east of Lyon. In the rest of the Rhône, it will remain medium.