Observed trends in ground-level O3 in Monterrey, Mexico, during 1993–2014: comparison with Mexico City and Guadalajara

Here, we present an assessment of long-term trends in O3 and odd oxygen (O3 + NO2) at the industrial Monterrey metropolitan area (MMA) in NE Mexico. Diurnal amplitudes in Ox (AVd) are used as a proxy for net O3 production, which is influenced by the NO2 photolysis rate. No significant differences in...

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Published in:Atmospheric chemistry and physics 2017-07, Vol.17 (14), p.9163-9185
Main Authors: Hernández Paniagua, Iván Y, Clemitshaw, Kevin C, Mendoza, Alberto
Format: Article
Language:English
Subjects:
Air pollution
Annual variations
Area
Diurnal
Emissions
Industrial areas
Metropolitan areas
Mixing ratio
Nitrogen dioxide
Oxygen
Photolysis
Pollutants
Polymethyl methacrylate
Production increases
Quality
Site location
Spring
Spring (season)
Suburban areas
Trends
VOCs
Volatile organic compounds
Wind
Wind power
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Clemitshaw, Kevin C
Mendoza, Alberto
description Here, we present an assessment of long-term trends in O3 and odd oxygen (O3 + NO2) at the industrial Monterrey metropolitan area (MMA) in NE Mexico. Diurnal amplitudes in Ox (AVd) are used as a proxy for net O3 production, which is influenced by the NO2 photolysis rate. No significant differences in the AVd are observed between weekends and weekdays, although the largest AVd values are observed at sites downwind of industrial areas. The highest O3 mixing ratios are observed in spring, with minimum values in winter. The largest annual variations in O3 are typically observed downwind of the MMA, with the lowest variations generally recorded in highly populated areas and close to industrial areas. A wind sector analysis of mixing ratios of O3 precursors revealed that the dominant sources of emissions are located in the industrial regions within the MMA and surrounding area. Significant increasing trends in O3 in spring, summer, and autumn are observed depending on site location, with trends in annual averages ranging between 0.19 and 0.33 ppb yr−1. Overall, from 1993 to 2014, within the MMA, O3 has increased at an average rate of 0.22 ppb yr−1 (p 
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Diurnal amplitudes in Ox (AVd) are used as a proxy for net O3 production, which is influenced by the NO2 photolysis rate. No significant differences in the AVd are observed between weekends and weekdays, although the largest AVd values are observed at sites downwind of industrial areas. The highest O3 mixing ratios are observed in spring, with minimum values in winter. The largest annual variations in O3 are typically observed downwind of the MMA, with the lowest variations generally recorded in highly populated areas and close to industrial areas. A wind sector analysis of mixing ratios of O3 precursors revealed that the dominant sources of emissions are located in the industrial regions within the MMA and surrounding area. Significant increasing trends in O3 in spring, summer, and autumn are observed depending on site location, with trends in annual averages ranging between 0.19 and 0.33 ppb yr−1. Overall, from 1993 to 2014, within the MMA, O3 has increased at an average rate of 0.22 ppb yr−1 (p &lt; 0. 01), which is in marked contrast with the decline of 1.15 ppb yr−1 (p &lt; 0. 001) observed in the Mexico City metropolitan area (MCMA) for the same period. 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Overall, from 1993 to 2014, within the MMA, O3 has increased at an average rate of 0.22 ppb yr−1 (p &lt; 0. 01), which is in marked contrast with the decline of 1.15 ppb yr−1 (p &lt; 0. 001) observed in the Mexico City metropolitan area (MCMA) for the same period. No clear trend is observed from 1996 to 2014 within the Guadalajara metropolitan area (GMA).</abstract><cop>Katlenburg-Lindau</cop><pub>Copernicus GmbH</pub><doi>10.5194/acp-17-9163-2017</doi><tpages>23</tpages><oa>free_for_read</oa></addata></record>
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subjects Air pollution
Annual variations
Area
Diurnal
Emissions
Industrial areas
Metropolitan areas
Mixing ratio
Nitrogen dioxide
Oxygen
Photolysis
Pollutants
Polymethyl methacrylate
Production increases
Quality
Site location
Spring
Spring (season)
Suburban areas
Trends
VOCs
Volatile organic compounds
Wind
Wind power
title Observed trends in ground-level O3 in Monterrey, Mexico, during 1993–2014: comparison with Mexico City and Guadalajara
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