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At the 2004 Car free Day in Montreal, Canada, measurements taken by the city showed a 90% reduction in the level of nitrogen monoxide (NO) and a 100% reduction in carbon monoxide (CO) within the area closed to cars that day as compared to readings taken the same day at an intersection where motor vehicle traffic was normal. Also, a 38% drop in the ambient noise level was also recorded within the car free zone. |
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