Atmospheric pollution by PM and O in the guadalajara metropolitan area, Mexico
Atmosphere, ISSN: 2073-4433, Vol: 9, Issue: 7
2018
- 10Citations
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- 1Mentions
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Article Description
To study the air quality in the Guadalajara Metropolitan Area (GMA), concentrations of suspended particles (PM) and ozone (O) reported by eight monitoring stations were analyzed. Also, six commonly found types of synoptic situations (TSS) during 1996-2016 were identified using an atmospheric pattern correlation method on the mean sea level pressure and geopotential heights (850 hPa, 500 hPa, and 200 hPa) of fields given by the North American Regional Reanalysis (NARR) database. Overall, 75% of the period of study was classified as one of the six TSS. Afterward, statistical significance tests (confidence level 95%) were applied to determine whether the TSS affected PM and O concentrations locally in the GMA. PM maximum hourly concentrations (~76.7 μg/m3) occurred around 8 am local time, while that of ozone (~0.054 ppm) occurred between 1-4 pm local time. Meanwhile, PM monthly levels were higher between December and May, and the highest O concentrations occurred between April and June. Average annual levels of PM have decreased through the years, while the annual trend of mean O concentrations seemed to respond to the 11-year solar cycle. It was also found that during "convective-allowing situations" (TSS VI) and "thermal low over California" (TSS I), PM concentrations remained low in the GMA, and O concentrations rose under the influence of a "low-pressure system over the United States (USA)" (TSS II). Further research is suggested to address the effect of the local circulation in the GMA linked to the TSS on O and PM concentrations.
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