On-road Remote Sensing of Vehicle Emissions in Monterrey, N.l. Mexico
نویسندگان
چکیده
Mexico to monitor remotely the carbon monoxide (CO), hydrocarbons (HC) and nitric oxide (NO) emissions of the local vehicle fleet. In four days of monitoring at four different locations within the city, 26,534 vehicles passed the sensor. In all more than 24,000 valid measurements were obtained for CO, more than 23,000 for HC and more than 16,000 for NO. Mean values for each species were 1.69% CO (149 grams CO/liter of fuel), 0.067% HC as propane (9 grams HC/liter) and 0.143% NO (14 grams NO/liter). Table A compares the on-road emissions measured in Monterrey with other cities that have been sampled in Mexico. The on-road emission averages are similar to the latest Mexico City data while being much lower than Juarez. In 1991 the nation of Mexico started requiring new vehicles to be manufactured to lower emissions standards which required the addition of catalytic convertors to all vehicles. This has resulted in a large decrease in fleet averaged emissions for Mexico City (between 1991 and 1994 overall CO and HC averages have decreased by a factor of 2). Juarez is likely to have seen less of a decrease because of the availability of older inexpensive vehicles from the United States. Emission levels in Monterrey remain two to four times larger than typical U.S. cities like Denver, CO. One emissions observation which stands out in Monterrey as it does in the other Mexican Table A. Comparison of RSD on-road emission averages.
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