anti poiiution light?

I was driving my 307 1.6 hdi estate this morning to work, when the anti-pollution came on and then the engine management light came on,about thity seconds later the engine cut out. I parked the car, waited about a minute and started the car, the car was fine after that but the engine management light is still on and the car is smoking quite a bit from the exhaust, the car also I think needs a sevice. Any advice.