Response of a grassland ecosystem to air pollutants. VI. The chemical climate: concentrations and potential flux densities of relevant criteria pollutants

1998 ◽  
Vol 101 (2) ◽  
pp. 215-220 ◽  
Author(s):  
L. Grünhage ◽  
U. Dämmgen ◽  
H.-D. Haenel ◽  
H.-J. Jäger
Keyword(s):  
Air Pollutants ◽  
Grassland Ecosystem ◽  
Criteria Pollutants ◽  
Chemical Climate

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

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 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.

Some Effects of Oxidant Air Pollutants (Ozone and Peroxyacetyl Nitrate) on the Ultrastructure of Leaf Tissues

1972 ◽  
Vol 30 ◽  
pp. 360-361
Author(s):  
William W. Thomson ◽  
Elizabeth S. Swanson
Keyword(s):  
Air Pollutants ◽  
Electron Microscopic Examination ◽  
Peroxyacetyl Nitrate ◽  
Electron Microscopic ◽  
Growth Physiology ◽  
Physiology And Biochemistry ◽  
Entire Plant ◽  
Leaf Tissues ◽  
Gaseous Hydrocarbons ◽  
The Individual

The oxidant air pollutants, ozone and peroxyacetyl nitrate, are produced in the atmosphere through the interaction of light with nitrogen oxides and gaseous hydrocarbons. These oxidants are phytotoxicants and are known to deleteriously affect plant growth, physiology, and biochemistry. In many instances they induce changes which lead to the death of cells, tissues, organs, and frequently the entire plant. The most obvious damage and biochemical changes are generally observed with leaves.Electron microscopic examination of leaves from bean (Phaseolus vulgaris L.) tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated for .5 to 2 hours with 0.3 -1 ppm of the individual oxidants revealed that changes in the ultrastructure of the cells occurred in a sequential fashion with time following the fumigation period. Although occasional cells showed severe damage immediately after fumigation, the most obvious change was an enhanced clarity of the cell membranes.

Freeze-dried dispersions for automated SEM analysis of individual submicron airborne particulates

1992 ◽  
Vol 50 (1) ◽  
pp. 408-409
Author(s):  
Karen A. Katrinak ◽  
David W. Brekke ◽  
John P. Hurley
Keyword(s):  
Air Pollutants ◽  
Size Range ◽  
Sem Analysis ◽  
Individual Particle ◽  
Chemical Data ◽  
Particle Analysis ◽  
Bulk Analysis ◽  
Airborne Particulates ◽  
Freeze Dried ◽  
Individual Particle Analysis

Individual-particle analysis is well established as an alternative to bulk analysis of airborne particulates. It yields size and chemical data on a particle-by-particle basis, information that is critical in predicting the behavior of air pollutants. Individual-particle analysis is especially important for particles with diameter < 1 μm, because particles in this size range have a disproportionately large effect on atmospheric visibility and health.

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