scholarly journals Overview and Seasonality of PM10 and PM2.5 in Guayaquil, Ecuador

2021 ◽  
Author(s):  
Daniel Moran-Zuloaga ◽  
Wilson Merchan-Merchan ◽  
Emilio Rodríguez-Caballero ◽  
Philip Hernick ◽  
Julio Cáceres ◽  
...  
Keyword(s):  
Ambient Air ◽  
Suspended Particles ◽  
Dry Season ◽  
Particle Analysis ◽  
Urban Dust ◽  
Wet Season ◽  
Vertical Column ◽  
Mean Values ◽  
Total Suspended Particles ◽  
The City

AbstractThe focus of this study is the assessment of total suspended particles (TSP) and particulate matter (PM) with various aerodynamic diameters in ambient air in Guayaquil, a city in Ecuador that features a tropical climate. The urban annual mean concentrations of TSP (Total Suspended Particles), and particle matter (PM) with various aerodynamic diameters such as: PM10, PM2.5 and PM1 are 31 ± 14 µg m−3, 21 ± 9 µg m−3, 7 ± 2 µg m−3 and 1 ± 1 µg m−3, respectively. Air mass studies reveal that the city receives a clean Southern Ocean breeze. Backward trajectory analysis show differences between wet and dry seasons. During the dry season, most winds come from the south and southwest, while air masses from the peri urban may contribute as pollutant sources during the wet season. Although mean values of PM10 and PM2.5 were below dangerous levels, our year-round continuous monitoring study reveals that maximum values often surpassed those permissible limits allowed by the Ecuadorian norms. A cluster analysis shows four main paths in which west and southwest clusters account for more than 93% of the pollution. Total vertical column of NO2 shows the pollution footprint is strongest during the dry season, as opposed to the wet season. A microscopic morphological characterization of ambient particles within the city during the wet and the dry season reveals coarse mode particles with irregular and rounded shapes. Particle analysis reveals that samples are composed of urban dust, anthropogenic and organic debris during the dry season while mainly urban dust during the wet season.

scholarly journals Geospatial and Geostatistical Analyses of Particulate Matter (PM10) Concentrations in Imo State, Nigeria

2016 ◽  
Vol 57 ◽  
pp. 89-107 ◽  
Author(s):  
Alex Iheanyichukwu Opara ◽  
Francis Chizoruo Ibe ◽  
Pascal Chukwuemeka Njoku ◽  
Jude Ikechukwu Alinnor ◽  
Conrad Kenechukwu Enenebeaku
Keyword(s):  
Particulate Matter ◽  
Air Quality ◽  
Ambient Air ◽  
Dry Season ◽  
Air Pollutant ◽  
Wind Rose ◽  
Wet Season ◽  
Mean Values ◽  
Imo State ◽  
The Mean

Geospatial and geostatistical analysis of particulate matter (PM10) variation in Imo State, Nigeria was carried out. The objectives of the study were to determine and analyze the variation in concentration of ambient PM10level in Imo State, Nigeria. Air quality sampling was conducted within November 2014 and June 2015, in wet and dry seasons three times daily using Haze Dust Particulate Monitor (10μm). The mean concentration of PM10level observed in the study varied from 5.22 - 6.63 mg/m3in wet season and 5.80 - 8.38 mg/m3in dry season. Coefficient of variation (CV %) revealed that the variability of PM10level ranged between little and moderate variations in both wet and dry season. Analysis of variance (ANOVA p<0.05) showed statistically significant variation in the mean PM10level in the study locations. Box and Whisker plots confirmed variation of PM10in the morning, afternoon and evening. The GIS plots revealed the spatial attributes of the air pollutant in the study locations. Time series plots indicate that the air pollutants fluctuated throughout the study duration. The Wind Rose suggests that the prevailing wind speed and wind directions were responsible for the dispersal migration of the air pollutant in the study area. The highest seasonal mean values were observed in Egbema and Okigwe area in both dry and wet season. The seasonal mean values recorded in the study exceeded the Nigerian National Ambient Air Quality Standards. This calls for urgent response to prevent further air quality deterioration and its negative effects on man and the environment.

TOTAL SUSPENDED PARTICLES AND PM10 IN AMBIENT AIR IN MADRID (SPAIN)

2001 ◽  
Vol 32 ◽  
pp. 771-772
Author(s):  
P. SALVADOR ◽  
B. ARTIÑANO ◽  
D.G. ALONSO ◽  
X. QUEROL
Keyword(s):  
Ambient Air ◽  
Suspended Particles ◽  
Total Suspended Particles

Distribution of PBDEs in Atmospheric Total Suspended Particles Collected from Kunming, China

2014 ◽  
Vol 955-959 ◽  
pp. 1204-1209
Author(s):  
Xiao Li ◽  
Xiao Man Li ◽  
Xiao Xia Yang ◽  
Qiang Li ◽  
Bin Huang ◽  
...  
Keyword(s):  
Hong Kong ◽  
Polybrominated Diphenyl Ethers ◽  
Suspended Particles ◽  
Mean Value ◽  
Urban Center ◽  
Total Suspended Particles ◽  
Diphenyl Ethers ◽  
The City ◽  
Reliable Analytical Method

An efficient and reliable analytical method has been used for determination of polybrominated diphenyl ethers (PBDEs) in atmospheric total suspended particles collected from the six state controlling air sampling sites and two self-selection sampling sites in Kunming, China. The results showed that the overall average concentrations of TSP collected from Kunming were in the range of 44.36 μg/m3 to 82.22 μg/m3. This pattern was lower than the average concentrations of Guiyu, Guangzhou and similar to Hong Kong. In TSP, the penta-BDEs and octa-BDEs were the dominant PBDEs and the PBDEs concentration ranged from 12.39 pg/m3 to 71.51 pg/m3, with a mean value of 46.82 pg/m3. This level was below the city of Guiyu, Örebro in Sweden and similar to Hong Kong, Guangzhou. The average concentrations of PBDEs had the trend of descent from the urban center to the outskirts of Kunming.

scholarly journals Diel and seasonal changes of biogenic volatile organic compounds within and above an Amazonian rainforest

2015 ◽  
Vol 15 (6) ◽  
pp. 3359-3378 ◽  
Author(s):  
A. M. Yáñez-Serrano ◽  
A. C. Nölscher ◽  
J. Williams ◽  
S. Wolff ◽  
E. Alves ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Ambient Air ◽  
Dry Season ◽  
Solar Irradiation ◽  
Biogenic Volatile Organic Compounds ◽  
Wet Season ◽  
Mixing Ratios ◽  
Volatile Organic ◽  
Amazonian Rainforest

Abstract. The Amazonian rainforest is a large tropical ecosystem, which is one of the last pristine continental terrains. This ecosystem is ideally located for the study of diel and seasonal behaviour of biogenic volatile organic compounds (BVOCs) in the absence of local human interference. In this study, we report the first atmospheric BVOC measurements at the Amazonian Tall Tower Observatory (ATTO) site, located in central Amazonia. A quadrupole proton-transfer-reaction mass spectrometer (PTR-MS), with seven ambient air inlets, positioned from near ground to about 80 m (0.05, 0.5, 4, 24, 38, 53 and 79 m above the forest floor), was deployed for BVOC monitoring. We report diel and seasonal (February–March 2013 as wet season and September 2013 as dry season) ambient mixing ratios for isoprene, monoterpenes, isoprene oxidation products, acetaldehyde, acetone, methyl ethyl ketone (MEK), methanol and acetonitrile. Clear diel and seasonal patterns were observed for all compounds. In general, lower mixing ratios were observed during night, while maximum mixing ratios were observed during the wet season (February–March 2013), with the peak in solar irradiation at 12:00 LT (local time) and during the dry season (September 2013) with the peak in temperature at 16:00 LT. Isoprene and monoterpene mixing ratios were the highest within the canopy with a median of 7.6 and 1 ppb, respectively (interquartile range (IQR) of 6.1 and 0.38 ppb) during the dry season (at 24 m, from 12:00 to 15:00 LT). The increased contribution of oxygenated volatile organic compounds (OVOCs) above the canopy indicated a transition from dominating forest emissions during the wet season (when mixing ratios were higher than within the canopy), to a blend of biogenic emission, photochemical production and advection during the dry season when mixing ratios were higher above the canopy. Our observations suggest strong seasonal interactions between environmental (insolation, temperature) and biological (phenology) drivers of leaf BVOC emissions and atmospheric chemistry. Considerable differences in the magnitude of BVOC mixing ratios, as compared to other reports of Amazonian BVOC, demonstrate the need for long-term observations at different sites and more standardized measurement procedures, in order to better characterize the natural exchange of BVOCs between the Amazonian rainforest and the atmosphere.

scholarly journals Effects of Effluents on the Quality of River Rido, Kaduna- State, Nigeria

2020 ◽  
Vol 12 (1) ◽  
pp. 159-170
Author(s):  
Louis Buggu ◽  
Funmilayo Yusufu - Alfa ◽  
Abigail Abenu
Keyword(s):  
Heavy Metals ◽  
Treatment Plant ◽  
World Health Organisation ◽  
Dry Season ◽  
World Health ◽  
Wet Season ◽  
Mean Values ◽  
The World ◽  
Effluent Discharge

This study examines the effect of discharged effluents on the quality of river Rido in Kaduna. Ten water samples were collected and tested for Arsenic (As), Cadmium (Cd), Chromium (Cr), Copper (Cu), Iron (Fe), Lead (Pb), Manganese (Mn), Mercury (Hg), Nickel (Ni) and Zinc (Zn). The results revealed that in  the dry season,  six heavy metals, namely As, Cd, Cu, Mn, Ni and Zn, presented mean values that were  higher  after the point of effluent discharge; while Cr, Fe and Pb  had lower values and Hg was not detected. In the wet season all the heavy metals tested, except Hg, increased in values after the point of effluent discharge. The values of As, Cd,  Fe, Mn, Ni and Pb after the discharge point, in dry and wet seasons, were greater than the maximum tolerable limits set by the Standard Organisation of Nigeria (SON) and the World Health Organisation (WHO).  The values recorded for Zn and Cu at both dry and wet seasons were below the limit set by the Standard Organisation of Nigeria (SON) and the World Health Organisation (WHO), but the value of Cr was lower than the maximum tolerable limit only in the dry season.  The contamination of the river with heavy metals poses a grave danger to human health, as its water is used for diverse purposes. The wastewater treatment plant of KRPC should be rehabilitated and the wastewater can be pre-treated before it is discharged into the river.

scholarly journals Spatial Assessment of Land Surface Temperature and Emissivity in the Tropical Littoral City of Port Harcourt, Nigeria

2019 ◽  
pp. 88-103 ◽  
Author(s):  
P. Nwaerema ◽  
Ojeh N. Vincent ◽  
C. Amadou ◽  
Atuma, I. Morrison
Keyword(s):  
Surface Temperature ◽  
Land Surface Temperature ◽  
Land Surface ◽  
Dry Season ◽  
Wet Season ◽  
City Center ◽  
Multiple Wavelength ◽  
Port Harcourt ◽  
Land Surfaces ◽  
The City

The study examined Land Surface Temperature (LST) and Land Surface Emissivity (LSE) in a tropical coastal city of Port Harcourt and its environs. Satellite remote sensing of multiple-wavelength origin was employed to derive data from the Landsat Enhance Thematic Mapper (ETM+). Statistical mean and range were used to show pattern of LST and LSE. The study established the relationship and characteristics of land use land cover, built-up area and influence of population on land surfaces. With population of over 3,095,342 persons occupying surface area of approximately 458,28 Km2, rapid vegetal and water body lost have put the city area under pressure of 4.7°C heat bias at the interval of 15 years. From rural fringes to the city center, LST varies with 9.3°C in wet season and 4.8°C in the dry season. During the dry season, LSE is severe in the southern part of the city contributed by water bodies, more vegetal cover and urban pavement materials. Emissivity in the wet season varied with 0.0136 and 0.0006 during the dry season but differs with 0.0165 between the two seasons. One critical finding is that LSE decreases from the rural fringes to the city center and LST increases from the rural fringes to the city center. It is recommended that urban greening at the city center should be practiced and the rural fringes should be explored by decongesting activities at the city center to the outskirts in order to ameliorate the effects of urban heat bias without further delay.

ASSESSMENT OF POLLUTION HAZARDS OF GROUNDWATER RESOURCE IN ABEOKUTA NORTH LOCAL GOVERNMENT AREA, OGUN STATE, SOUTHWESTERN NIGERIA

2017 ◽  
Vol 15 (1) ◽  
pp. 42-56
Author(s):  
S A ISHOLA ◽  
V MAKINDE ◽  
I C OKEYODE ◽  
F G AKINBORO ◽  
H AYEDUN ◽  
...  
Keyword(s):  
Public Health ◽  
Water Quality ◽  
Local Government ◽  
Solid Waste ◽  
Quality Parameters ◽  
Dry Season ◽  
Total Hardness ◽  
Wet Season ◽  
Mean Values ◽  
Physico Chemical

Pollution of wells and borehole water, either from point or non-point sources, has become a matter of health concern both in urban and rural areas. Groundwater is tapped for domestic uses through the con-struction of hand dug wells and boreholes. However, while providing an alternative to the public water supply sources; most of the boreholes are often located too close to possible contamination sources. Various land use and human activities such as solid waste landfills, cemetery and animal wastes, among others can result in ground water contamination. In an open or buried dumping solid waste or sanitary landfill, the organic and inorganic by-products resulting from the decomposition of wastes are leached out by the infiltration of rainfall. A release of leachate to the surrounding soil without proper collection and treatment could contaminate groundwater resources. Many of the wells and boreholes in the study area were found to be indiscriminately located and scattered among such impairing lands/features. This study was therefore aimed at assessing the pollution hazards and vulnerability of groundwater resource in Abe-okuta North Local Government Area (LGA) by sampling some boreholes from selected locations in the area. Water samples were collected and analyzed for water quality parameters using standard proce-dures. The parameters determined were Turbidity, Temperature, Electrical Conductivity (EC), pH, Total Dissolved Solids (TDS) Total Suspended Solids (TSS), Total Solids (TS), Total hardness, cations {Potassium (K), Sodium (Na), Calcium (Ca), Magnesium (Mg), Manganese (Mn), iron (Fe)}, anions {Chloride (Cl-), Nitrate (NO3-), Sulphate (SO42-), Phosphate (PO43-)}, and heavy metals {lead (Pb2+), Zinc (Zn2+), Copper (Cu2+)}. Results were subjected to statistical evaluations using SPSS 18.0 for descriptive statistics and Analysis of Variance (ANOVA). It was observed that the elemental parameters in the bore-holes sampled have mean values of the concentrations of Fe2+, Na+, Cl- , SO42-, Pb2+, Mn2+, Cu2+ and Zn2+ higher during the wet season relative to dry season. For the physico-chemical parameters, it was equally observed that parameters such as EC, TDS, TS, TSS were higher during the wet season than dry season while turbidity, temperature, pH and total hardness were higher during dry season than in the wet season. Water quality parameters such as Fe2+, Pb2+, NO3-, and EC have mean values greater than World Health Organization and NESREA maximum permissible standards for drinking water. Elevated values of these parameters are of great concern to public health when the water from these boreholes is consumed without treatment by people. It is recommended that well and borehole waters in this area be adequately treated before consumption using advanced inorganic removal techniques such as Nano-filtration and Reverse Osmosis to safeguard human health in the study area.Keywords: Boreholes, pollution, water quality, public health, physico-chemical

Diurnal and Seasonal Variations of Sensible and Latent Heat Fluxes at an Agricultural Site in Ile-Ife, Southwest Nigeria

2020 ◽  
Author(s):  
Adewale Ajao ◽  
Omodara Obisesan ◽  
Muritala Ayoola ◽  
Oluwagbemiga Jegede
Keyword(s):  
Latent Heat ◽  
Seasonal Variations ◽  
Bowen Ratio ◽  
Dry Season ◽  
Heat Fluxes ◽  
Wet Season ◽  
Mean Values ◽  
Diurnal Range ◽  
Southwest Nigeria ◽  
Agricultural Site

&lt;p&gt;Diurnal and seasonal variations of sensible heat (&lt;em&gt;H&lt;/em&gt;) and latent heat (&lt;em&gt;LE&lt;/em&gt;) fluxes observed at an agricultural site on the campus of Obafemi Awolowo University, Ile-Ife, southwest Nigeria have been reported in this paper. The deductions are made based on half-hourly flux data acquired from an open-path eddy covariance (OPEC) system measured continuously over a two-year observation period (2017-2018) at the study site. The study area is within tropical wet and dry climate of West Africa, thereby experiencing an alternating wet (that is, April &amp;#8211; October) and dry (that is, December &amp;#8211; February) seasons (monsoonal). Our results showed that peak hourly values of &lt;em&gt;H&lt;/em&gt; and &lt;em&gt;LE&lt;/em&gt; occurred at about 13:00 LT and 14:00 LT respectively, a lag of approximately one hour between them at the location. The diurnal range for &lt;em&gt;H&lt;/em&gt; and &lt;em&gt;LE&lt;/em&gt; during wet season was 75.3 W m&lt;sup&gt;-2&lt;/sup&gt; and 177.0 W m&lt;sup&gt;-2&lt;/sup&gt; respectively, while for dry season it was 182.0 W m&lt;sup&gt;-2&lt;/sup&gt; and 89.9 W m&lt;sup&gt;-2&lt;/sup&gt; respectively. The daily mean value of &lt;em&gt;H&lt;/em&gt; for wet season was 19.7 &amp;#177; 27.2 W m&lt;sup&gt;-2&lt;/sup&gt; and it was 52.1 &amp;#177; 63.5 W m&lt;sup&gt;-2 &lt;/sup&gt;for &lt;em&gt;LE&lt;/em&gt;. For dry season, daily mean values for &lt;em&gt;H&lt;/em&gt; and &lt;em&gt;LE&lt;/em&gt; were 44.0 &amp;#177; 66.4 W m&lt;sup&gt;-2&lt;/sup&gt; and 26.6 &amp;#177; 33.7 W m&lt;sup&gt;-2&lt;/sup&gt; respectively. A transition of seasons from wet (Bowen ratio, &lt;em&gt;Bo&lt;/em&gt; &lt; 1) to dry (&lt;em&gt;Bo&lt;/em&gt; &gt; 1) was observed in November and reversal in March.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Keywords&lt;/strong&gt;: Diurnal and Seasonal Variations, Sensible and Latent Heat Fluxes, Tropical Wet and Dry Climate&lt;/p&gt;

scholarly journals Seasonal leaf gas exchange and water potential in a woody cerrado species community

2004 ◽  
Vol 16 (1) ◽  
pp. 7-16 ◽  
Author(s):  
Carlos Henrique Britto de Assis Prado ◽  
Zhang Wenhui ◽  
Manuel Humberto Cardoza Rojas ◽  
Gustavo Maia Souza
Keyword(s):  
Gas Exchange ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Dry Season ◽  
Leaf Water ◽  
Wet Season ◽  
Leaf Water Status ◽  
Mean Values

Predawn leaf water potential (psipd) and morning values of leaf gas exchange, as net photosynthesis (A), stomatal conductance (gs), transpiration (E), and morning leaf water potential (psimn) were determined seasonally in 22 woody cerrado species growing under natural conditions. Despite the lower mean values of psipd in the dry season (-0.35 ± 0.23 MPa) compared to the wet season (-0.08 ± 0.03 MPa), the lowest psipd in the dry season (-0.90 ± 0.00 MPa) still showed a good nocturnal leaf water status recovery for all species studied through out the year. Mean gs values dropped 78 % in the dry season, when the vapor pressure of the air was 80% greater than in the wet season. This reduction in gs led to an average reduction of 33% in both A and E, enabling the maintainance of water use efficiency (WUE) during the dry season. Network connectance analysis detected a change in the relationship between leaf gas exchange and psimn in the dry season, mainly between gs-E and E-WUE. A slight global connectance value increase (7.25 %) suggested there was no severe water stress during the dry season. Multivariate analysis showed no link between seasonal response and species deciduousness, suggesting similar behavior in remaining leaves for most of the studied species concerning leaf gas exchange and psimn under natural drought.

scholarly journals Seasonal trends of Benzo(a)pyrene in urban suspended particulate matter of Belgrade City, Serbia

2010 ◽  
Vol 16 (3) ◽  
pp. 259-268 ◽  
Author(s):  
Anka Cvetkovic ◽  
Milena Jovasevic-Stojanovic ◽  
Ljiljana Adjanski-Spasic ◽  
Snezana Matic-Besarabic ◽  
Dragan Markovic
Keyword(s):  
Winter Season ◽  
Monitoring Program ◽  
Monitoring Network ◽  
Ambient Air ◽  
Suspended Particles ◽  
Pollution Monitoring ◽  
Air Pollution Monitoring ◽  
National Regulation ◽  
Total Suspended Particles ◽  
Almost All

Polycyclic aromatic hydrocarbons (PAHs) were identified to be one of the major toxic air pollutants in urban environment. PAHs are mostly formed during incomplete combustion or pyrolysis of organic material. According to Serbian National Legislation Benzo(a)pyrene (BaP) concentration in total suspended particles (TSP) in ambient air in Belgrade Metropolitan has been determined in the last ten years, as a part of local air pollution monitoring program performed by Public Health Institute of Belgrade and funded by Belgrade?s Municipality. Air samples for analysis of BaP in suspended particles have been collected (as 24h sample once per month) at selected monitoring sites within municipal air quality monitoring network. At the beginning, According to National Regulation, all samples were taken as total suspended particles (TSP). Since middle of 2008, the procedure of sampling methodology was harmonized with EU requirements and solid fraction PM10 has been collected and analyzed using GC/MS. In this study, we have analyzed results of TSP collected between 2005 and-2008. Looking through the results obtained during the period of whole year, it can be noticed that concentrations of BaP were much higher during winter season at almost all measuring sites.

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