Atmospheric Pollution by PM10 and O3 in the Guadalajara Metropolitan Area, Mexico

Fonseca-Hernández, Mariam; Tereshchenko, Iryna; Mayor, Yandy G.; Montaño, Arturo Figueroa; Cuesta-Santos, Osvaldo; Monzón, César

doi:10.3390/atmos9070243

Cited by 11 publications

(4 citation statements)

References 30 publications

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“…The decline in water quality reported to occur yearly in April and May is consistent with the marked decline in water quality that occurred during the end of the dry season in 2016 as reported by COFEPRIS, Mexico's Federal Commission for the Protection against Sanitary Risk (Figure 2) [23]. The dry season on average begins in October and ends as the rainy season begins in May [24]. Although such aesthetic problems are not always harmful, they can be related to contamination.…”

Section: Discussionsupporting

confidence: 82%

Bacterial Contamination of Drinking Water in Guadalajara, Mexico

Rubino

Corona²,

Pérez

et al. 2018

Preprint

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In many regions where drinking water supply is intermittent and unreliable, households adapt by storing water in cisterns or rooftop tanks. Both intermittent supply and stored water can be vulnerable to contamination by microorganisms with deleterious health effects. The Guadalajara Metropolitan Area is a rapidly growing urban center with over five million residents where household storage is nearly ubiquitous. This pilot study was conducted in July 2018 to examine the microbiological quality of drinking water in Guadalajara. Samples were tested for free available chlorine residual, total coliform bacteria, and E. coli. A survey on access to water and public perspectives was also conducted. Water exiting rooftop tanks exceeded regulatory limits for total coliform levels in half of the homes studied. Piped water arriving at two homes had total coliform levels that far exceeded regulatory limits. No E. coli were detected in any of the samples. Only 35% of homes had a chlorine residual between the recommended 0.2 and 1.5 mg/L. Many homes reported unpleasant odors and colors. Only 7% of residents drank the piped water. Future studies are needed, especially during April and May when many homes reported a higher disruption to water service.

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Section: Discussionsupporting

confidence: 82%

Bacterial Contamination of Drinking Water in Guadalajara, Mexico

Rubino

Corona²,

Pérez

et al. 2018

Preprint

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show abstract

“…The decline in water quality reported to occur yearly in April and May is consistent with the marked decline in water quality that occurred during the end of the dry season in 2016, as reported by COFEPRIS, Mexico’s Federal Commission for the Protection against Sanitary Risk (Figure 6) [23]. On average, the dry season begins in October and ends as the rainy season begins in May [24]. Although such aesthetic problems are not always harmful, they can be related to contamination.…”

Section: Discussionsupporting

confidence: 78%

Bacterial Contamination of Drinking Water in Guadalajara, Mexico

Rubino

Corona²,

Pérez³

et al. 2018

IJERPH

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In many regions where drinking water supply is intermittent and unreliable, households adapt by storing water in cisterns or rooftop tanks. Both intermittent supply and stored water can be vulnerable to contamination by microorganisms with deleterious health effects. The Metropolitan Zone of Guadalajara is a rapidly growing urban center with over five million residents where household storage is nearly ubiquitous. This pilot study was conducted in July 2018 to examine the microbiological quality of drinking water in Guadalajara. Samples were tested for free available chlorine residual, total coliform bacteria, and Escherichia coli. A survey on access to water and public perspectives was also conducted. Water exiting rooftop tanks exceeded regulatory limits for total coliform levels in half of the homes studied. Piped water arriving at two homes had total coliform levels that far exceeded regulatory limits. No E. coli were detected in any of the samples. Only 35% of homes had a chlorine residual between the recommended 0.2 and 1.5 mg/L. Many homes reported unpleasant odors and colors. Only 7% of residents drank the piped water. Future studies are needed, especially during April and May when many homes reported a higher disruption to water service.

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“…Through the application of the non-parametric Mann-Kendall test and the Sen method, a trend towards urban warming was detected, but no homogeneous behavior in all cities analyzed was found. An important observation was the significant prevalence of non-stationary series with the TXX in half of the cities analyzed; only Guadalajara, located in the center-west of the country, presented a significant negative trend, perhaps due the effect of "diming" by increases in aerosol pollution (Fonseca- Hernández et al, 2018). Therefore, the annual trends in daytime warming, represented by TXX, are not necessarily identical in all selected urban areas of Mexico.…”

Section: Discussionmentioning

confidence: 95%

Trends in Temperature Extremes in Selected Growing Cities of México Under a Non-Stationary Climate

García-Cueto

López-Velázquez

Bojórquez-Morales

et al. 2020

ATM

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México es un país vulnerable a los eventos climáticos extremos; sin embargo, el impacto no es uniforme en todo el territorio, por lo que se analizan y modelan las temperaturas extremas de 12 ciudades de México con la suposición de que existe un clima no estacionario en todas las regiones del país. A partir de la base climatológica disponible de temperaturas máximas y temperaturas mínimas, se estimó una tendencia temporal con las pruebas no paramétricas de Mann-Kendall y el método de pendiente de Sen, y se utilizó la distribución generalizada de valores extremos (GEV) para modelar ambas temperaturas. Para evaluar la fortaleza de los modelos propuestos con la incorporación de una covariable, se utilizaron tanto la prueba de razón de verosimilitud como los criterios de información de Akaike y de Bayes, y se estimaron los niveles de retorno para escenarios temporales futuros. Se detectó una tendencia al calentamiento urbano, tanto con las pruebas no paramétricas como con la distribución GEV, aunque con comportamiento heterogéneo. En la serie de temperatura máxima, la mitad de las ciudades analizadas se mostró no estacionaria; de éstas, la ciudad de Guadalajara, situada en el centro-occidente del país, presentó tendencia negativa. En el caso de las temperaturas mínimas la tendencia fue más uniforme: 90% de las ciudades se mostraron no estacionarias con tendencia positiva y sólo el 10% (una zona urbana al oriente de la zona metropolitana del Valle de México [Milpa Alta] y una ciudad costera del Golfo de México [Veracruz]) mostraron una serie estacionaria. Se concluye que los periodos de retorno de extremos térmicos estimados en un clima cambiante varían temporalmente, por lo que la modelación estadística debe tomar en cuenta ese comportamiento en razón de su importancia para valoraciones de riesgos y propósitos de adaptación.

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Atmospheric Pollution by PM10 and O3 in the Guadalajara Metropolitan Area, Mexico

Cited by 11 publications

References 30 publications

Bacterial Contamination of Drinking Water in Guadalajara, Mexico

Bacterial Contamination of Drinking Water in Guadalajara, Mexico

Bacterial Contamination of Drinking Water in Guadalajara, Mexico

Trends in Temperature Extremes in Selected Growing Cities of México Under a Non-Stationary Climate

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