نتایج جستجو برای: carbon dioxide and ozone
تعداد نتایج: 16899507 فیلتر نتایج به سال:
Experiments were performed to investigate the effects of sulfur dioxide (O-10 ppm) and chlorine (O-15 ppm) on ozone and nitric oxide concentrations in irradiated mixtures of nitrogen dioxide (1-5 ppm) and air. The mixtures were irradiated by ultraviolet fluorescent lamps while flowing at a steady speed through a 9 m long, 15.2 cm i.d. Pyrex tube. The presence of sulfur dioxide produced no measu...
BACKGROUND Tropospheric ozone and black carbon (BC), a component of fine particulate matter (PM ≤ 2.5 µm in aerodynamic diameter; PM(2.5)), are associated with premature mortality and they disrupt global and regional climate. OBJECTIVES We examined the air quality and health benefits of 14 specific emission control measures targeting BC and methane, an ozone precursor, that were selected beca...
Tropospheric ozone and black carbon (BC) contribute to both degraded air quality and global warming. We considered ~400 emission control measures to reduce these pollutants by using current technology and experience. We identified 14 measures targeting methane and BC emissions that reduce projected global mean warming ~0.5°C by 2050. This strategy avoids 0.7 to 4.7 million annual premature deat...
conclusions proximity to road traffic might be a risk factor for ra as there are suspected effects associated with no2 and so2. overall, the available evidence is too preliminary and scarce to draw firm conclusions. however, the results indicate the feasibility of further studies elucidating on the relationship between air pollution and ra. results four relevant papers were included in a qualit...
BACKGROUND Evidence indicates that asthma attacks can be triggered by exposure to ambient air pollutants, however, detailed pollution information is missing from asthma action plans. Asthma is commonly associated with four criteria pollutants with standards derived by the United States Environmental Protection Agency. Since multiple pollutants trigger attacks and risks depend upon city-specific...
In order to explore the temporal-spatial patterns and possible health effects of ozone in Shenzhen, daily concentrations of ozone and the daily mortality caused by cardiovascular and respiratory diseases were collected. Using Geographic Information System (GIS) and SPSS, the spatial and temporal patterns of ozone in Shenzhen were illustrated. Using a generalized additive model (GAM), the associ...
A regional air quality simulation framework including the Weather Research and Forecasting modeling system (WRF), the Community Multi-scale Air Quality modeling system (CMAQ), and precursor emissions to simulate tropospheric ozone over South and East Asia is introduced. Concentrations of tropospheric ozone and related species simulated by the framework are validated by comparing with observatio...
Nonmethane hydrocarbons (NMHCs) play an important role in the atmosphere. Photochemical oxidation of hydrocarbons leads to ozone (O3), organic acid, and carbon dioxide (CO2) production, with major implications for local and regional air quality, acid deposition, and the greenhouse effect. In addition, emissions of atmospheric NMHCs lead to an increased aerosol loading, which has major implicati...
A new version of the AFGL atmospheric absorption line parameters compilation is now available. Major modifications since the last edition of 1978 include the updating of the strongest bands of water vapor, updated line positions for carbon dioxide, improved ozone parameters in the 5- and 10-microm regions, and updated and additional data for methane in the 3.5- and 7.7-microm regions. The atlas...
Many important greenhouse gases (including water vapour, carbon dioxide, methane and ozone) absorb solar radiation. When gas concentrations change, this absorption exerts a radiative forcing that modifies the thermal infrared (‘longwave’) which is predominant for most (ozone being major exception). The nature of differs from longwave in several ways. For example, sign instantaneous can differ b...
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