Response of a grassland ecosystem to air pollutants. IV. The chemical climate: Concentrations of relevant non-criteria pollutants (trace gases and aerosols)

1996 ◽  
Vol 91 (2) ◽  
pp. 139-147 ◽  
Author(s):  
Ralf Zimmerling ◽  
Ulrich Dämmgen ◽  
Alwin Küsters ◽  
Ludger Grünhage ◽  
Hans-Jürgen Jäger
Keyword(s):  
Air Pollutants ◽  
Trace Gases ◽  
Grassland Ecosystem ◽  
Criteria Pollutants ◽  
Chemical Climate

scholarly journals Pilot Study of Air Quality during Pre and Post COVID-19 Lockdown: An Inadvertent Assistance to the Environment

2021 ◽  
pp. 213-220
Author(s):  
Akhtar Shareef ◽  
Durdana Rais Hashmi
Keyword(s):  
Particulate Matter ◽  
Air Quality ◽  
Pilot Study ◽  
Urban Areas ◽  
Air Pollutants ◽  
Virus Disease ◽  
Trace Gases ◽  
Industrial Areas ◽  
Criteria Pollutants ◽  
Novel Coronavirus

The main object of this study was to examine the levels of air quality in Karachi, Pakistan, before and during the 1st, 2nd and 3rd wave of lockdown period levied to control the spread of a novel coronavirus (COVID-19) in the environment of Karachi city. Momentous improvement in the air quality has been found during the ‘Lockdown’ being implemented due to the Corona Virus Disease (COVID -19) pandemic in Karachi city. Concentrations of trace gases and particulate matter were used to calculate the results according to the criteria of USEPA. We have analyzed data from fourteen different locations along the busy roads in commercial, residential and industrial areas of Karachi during the period of lockdown. Data were compared to the before lockdown (BL) and during the complete lockdown (CL 1stwave), smart lockdown (SL 2nd wave) and again complete lockdown (CL-2 3rd wave) of COVID pandemic. The results show drastic reductions in criteria pollutants (PM10, CO, SO2 and NOx) concentrations in all the selected area during lockdown period. This study explained the level of air quality and its relation to prepare alternative plans to mitigate the air pollutants and to improve the environment of urban areas.

Response of a grassland ecosystem to air pollutants:—II the chemical climate: Fluxes of sedimenting airborne matter

1994 ◽  
Vol 85 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Ulrich Dämmgen ◽  
Ludger Grünhage ◽  
Alwin Küsters ◽  
Hans-Jürgen Jäger
Keyword(s):  
Air Pollutants ◽  
Grassland Ecosystem ◽  
Chemical Climate

Response of grassland ecosystem to air pollutants: I—Experimental concept and site of the braunschweig grassland investigation program

1993 ◽  
Vol 81 (2) ◽  
pp. 163-171 ◽  
Author(s):  
Ludger Grünhage ◽  
Ulrich Dämmgen ◽  
Udo Hertstein ◽  
Hans-Jürgen Jäger
Keyword(s):  
Air Pollutants ◽  
Grassland Ecosystem

scholarly journals Observations of air composition in Brazil between the Equator and 20°s during the dry season.

1985 ◽  
Vol 15 (1-2) ◽  
pp. 77-120 ◽  
Author(s):  
P.J. Crutzen ◽  
M.T. Coffey ◽  
A.C. Delany ◽  
J. Greenberg ◽  
P. Haagenson ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Carbon Monoxide ◽  
Tropical Forests ◽  
Air Pollutants ◽  
Trace Gases ◽  
Dry Season ◽  
Photochemical Reactions ◽  
Ozone Concentrations ◽  
Air Chemistry ◽  
High Concentrations

Field measurement programs in Brazil during the dry season months of August and September in 1979 and 1980 have demonstrated the great importance of the continental tropics in global air chemistry. Especially in the mixed layer, the air composition over land is much different from that over the ocean and the land areas are clearly longe scale sources of many inportant trace gases. During the dry season much biomass, burning takes place especially in the cerrado regions leading to substantial emission of air pollutants, such as CO, NOx, N2O, CH4 and other hydrocarbons. Ozone concentrations are alsoenhanced due to photochemical reactions. Biogenic organic emissions from tropical forests play likewise an important role in the photochemistry of the atmosphere. Carbon monoxide was found to be present in high concentrations in the boundary layer of the tropical forest, but ozone concentrations were much lower than in the cerrado.

The Chemical Weather

2005 ◽  
Vol 2 (1) ◽  
pp. 6 ◽  
Author(s):  
Mark G. Lawrence ◽  
Øystein Hov ◽  
Matthias Beekmann ◽  
Jørgen Brandt ◽  
Hendrik Elbern ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Atmospheric Chemistry ◽  
Wind Direction ◽  
Strong Influence ◽  
Trace Gases ◽  
Short Term ◽  
Chemical Complexity ◽  
Chemical Climate ◽  
Short Term Variability

Environmental Context. Meteorological weather—temperature, pressure, wind direction—is familiar to all, and contrasts with meteorological climate in short-term (weather) versus long-term (climate) influence. From the atmospheric chemistry side, the focus has largely been on the chemical climate, the long-term mean concentrations of important trace gases and aerosols. An emerging new focus of study is the chemical weather—the tremendous short-term variability of the atmospheric chemical composition, resulting from the strong influence of meteorological variability, chemical complexity, and regionally and temporally varying emissions.

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