scholarly journals Secondary Air Pollutants and Forests — New Perspectives

2007 ◽  
Vol 7 ◽  
pp. 9-14 ◽  
Author(s):  
J. Neil Cape
Keyword(s):  
Air Pollutants ◽  
Leaf Surface ◽  
Biogenic Emissions ◽  
Eastern Asia ◽  
Pollutant Deposition ◽  
Volatile Organic ◽  
Secondary Air Pollutants ◽  
Secondary Air ◽  
Photochemical Oxidants

Air pollution has been known to affect forests for over a century, and many of the mechanisms of pollutant deposition and effects have been established, at least for forest trees. Changes in air quality as a result of emission controls in Europe and North America, or as a result of rapid industrialisation in southern and eastern Asia, have highlighted new pollution problems. This paper, by reference to recent publications, highlights two areas where more research is required: the interactions of photochemical oxidants with biogenic emissions of volatile organic compounds, and their impact on ecological signalling; and the role of atmospheric particles in changing the leaf surface environments in forests.

scholarly journals A physical modeling approach for identification of source regions of primary and secondary air pollutants

2006 ◽  
Vol 6 (4) ◽  
pp. 6467-6496 ◽  
Author(s):  
J. C. F. Lo ◽  
A. K. H. Lau ◽  
Z. B. Yuan ◽  
J. C. H. Fung ◽  
F. Chen
Keyword(s):  
Hong Kong ◽  
Air Pollutants ◽  
Power Plants ◽  
Three Dimensional ◽  
Air Pollutant ◽  
Regional Transport ◽  
Meteorological Model ◽  
Secondary Air Pollutants ◽  
Secondary Air ◽  
The Pearl River

Abstract. This paper describes a simple but practical methodology to identify the contribution of primary and secondary air pollutants from the local/regional emission sources to Hong Kong, a highly urbanized city with complex terrain and coastlines. The meteorological model MM5 coupled with a three-dimensional, mutli-particle trajectory model is used to identify salient aspects of regional air pollutant transport characteristics during some typical meteorological conditions over the Pearl River Delta (PRD) region. Several weighting factors are determined for calculating the air mass/pollutant trajectory and are used to evaluate the local and regional contribution of primary pollutants over the PRD to Hong Kong pollution. The relationships between emission inventories, physical paths and chemical transformation rates of the pollutants, and observational measurements are formulated. The local and regional contributions of secondary pollutants are obtained by this conceptual module under different weather scenarios. Our results demonstrate that major pollution sources over Hong Kong come from regional transport. In calm-weather situations, 78% of the respirable suspended particulates (RSP) totals in Hong Kong are contributed by regional transport, and 49% are contributed by the power plants within the PRD. In normal-day situations, 71% of the RSP are contributed by regional transport, and 45% are contributed by the power plants.

Formation and transport of secondary air pollutants: ozone and aerosols in the St. Louis urban plume

Science ◽  
1976 ◽  
Vol 194 (4261) ◽  
pp. 187-189 ◽  
Author(s):  
W. White ◽  
J. Anderson ◽  
D. Blumenthal ◽  
R. Husar ◽  
N. Gillani ◽  
...  
Keyword(s):  
Air Pollutants ◽  
Urban Plume ◽  
Secondary Air Pollutants ◽  
Secondary Air

scholarly journals Long-term Trends of Volatile Organic Compounds over the Texas, USA in the Past Two Decades

2021 ◽  
Vol 259 ◽  
pp. 01003
Author(s):  
Ruizhe Liu
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Oil And Gas ◽  
The Past ◽  
Volatile Organic ◽  
Long Term Trends ◽  
Secondary Air Pollutants ◽  
Secondary Air ◽  
Oil And Gas Companies

Volatile organic compounds (VOCs) are organic compounds in the air that have low vapor pressure. VOCs can be emitted from a variety of sources including biogenic, anthropogenic and pyrogenic processes. VOCs are precursors of aerosols and tropospheric 03. which harm human health. However, the potential of VOCs forming secondary air pollutants varies by species. Here, we analyze the long-term trends of soiu'ce. concentration and reactivity of six classes of VOCs from 1995 to 2018 over Texas. USA. VOCs emission from petroleum and related companies in Texas kept increasing these years. Among the VOCs tracers of oil and gas companies, the concentration of ethane kept increasing until 2015. Despite the increase of oil and gas related VOCs. the concentration of total VOCs and reactivity-weighted VOCs have decreased in the past two decades. We further investigate the seasonality of VOC reactivities, which depend on both temperature and VOC concentration. We find that VOC reactivity generally is highest in fall and lowest in spring, and such seasonality does not change over the two decades.

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