If you've noticed that it's rather smoggy in Paris then you'd better get used to it.
Airparif, which monitors pollution in the capital, said that the PM10 readings would be "elevated" throughout Tuesday.
For the second day in a row commuters will be able to buy a day pass for public transport for just €3.80, the price of two one-way tickets, no matter where in the city they are travelling.
The city used to roll out free public transport during such pollution hikes, but the €4 million cost proved too much.
Meanwhile, the Paris Prefecture of Police has announced that traffic restrictions will continue until at least midnight on Wednesday.
Any vehicles with a "Level 5" sticker on the new system will be banned from all roads inside the A86 motorway, the second ring road around Paris.
Level 5 vehicles are those with diesel engines from 1997 to 2000 (Euro 2).
Fines range from €68 to €135 and the ban applies for and will run from 5.30am each morning until midnight.
The stickers are the city's latest attempt to tackle pollution and were made a legal requirement last week for all vehicles in Paris.
The stickers replace the old system, which saw cars with odd or even-numbered registration plates banned from the roads on alternate days.
The anti-pollution stickers have been slow to catch on, however.
Authorities have said that most drivers still haven't got their stickers (despite having had the past six months to do so), and Paris police have said they will be lenient at first with those caught driving without them.