![A road sign limits the speed to 90 km per hour on the E411 highway in Overijse, central Belgium, December 30, 2008. Peaks of fine dust pollution above the limit of 70 A road sign limits the speed to 90 km per hour on the E411 highway in Overijse, central Belgium, December 30, 2008. Peaks of fine dust pollution above the limit of 70](https://c8.alamy.com/comp/2E71HGM/a-road-sign-limits-the-speed-to-90-km-per-hour-on-the-e411-highway-in-overijse-central-belgium-december-30-2008-peaks-of-fine-dust-pollution-above-the-limit-of-70-micrograms-per-cubic-meter-are-expected-tuesday-and-wednesday-a-maximum-speed-of-90-kph-is-implemented-on-most-belgian-highways-and-ring-roads-from-six-in-the-morning-on-tuesday-reuterssebastien-pirlet-belgium-2E71HGM.jpg)
A road sign limits the speed to 90 km per hour on the E411 highway in Overijse, central Belgium, December 30, 2008. Peaks of fine dust pollution above the limit of 70
![A road sign limits the speed to 90 km per hour on the E411 highway in Overijse, central Belgium, December 30, 2008. Peaks of fine dust pollution above the limit of 70 A road sign limits the speed to 90 km per hour on the E411 highway in Overijse, central Belgium, December 30, 2008. Peaks of fine dust pollution above the limit of 70](https://l450v.alamy.com/450v/2e7kp1t/a-road-sign-limits-the-speed-to-90-km-per-hour-on-the-e411-highway-in-overijse-central-belgium-december-30-2008-peaks-of-fine-dust-pollution-above-the-limit-of-70-micrograms-per-cubic-meter-are-expected-tuesday-and-wednesday-a-maximum-speed-of-90-kph-is-implemented-on-most-belgian-highways-and-ring-roads-from-six-in-the-morning-on-tuesday-reuterssebastien-pirlet-belgium-2e7kp1t.jpg)
A road sign limits the speed to 90 km per hour on the E411 highway in Overijse, central Belgium, December 30, 2008. Peaks of fine dust pollution above the limit of 70
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