Order of the National Green Tribunal in the matter of News Item titled “CSE report finds dangerous increase in ozone pollution across urban India” appearing in Down to Earth dated 06.08.2024. The Principal Bench of the NGT heard the matter on March 21, 2025. In the original application, registered suo …
Seasonal variations and effects of ambient air pollutants on palak (Beta vulgaris L. var. Allgreen) plants were investigated with respect to root, shoot length, number of leaves plant-1, leaf area and root and shoot biomass at a suburban site situated in dry tropical area of India, experiencing elevated levels of …
This study has used proton transfer reaction-mass spectrometry (PTR-MS) for direct air analyses of volatile products resulting from the reactions of ozone with human skin lipids. An initial series of small-scale in vitro and in vivo experiments were followed by experiments conducted with human subjects in a simulated office. The …
In the polar tropospheric boundary layer, reactive halogen species (RHS) are responsible for ozone depletion as well as the oxidation of elemental mercury and dimethyl sulphide. After polar sunrise, air masses enriched in reactive bromine cover areas of several million square kilometers. Still, the source and release mechanisms of halogens …
In the early 1970s, scientists warned that anthropogenic chemicals containing chlorine (Cl) would lead to destruction of stratospheric ozone (O3), the protective veil that reduces the amount of harmful ultraviolet (UV) rays that reach the Earth
New Delhi, Jan. 20: Air pollution from eastern and southern Asia, possibly from China and India, may be causing spikes in atmospheric ozone levels over North America, a study has suggested. The study by a team of international scientists has shown for the first time that tropospheric ozone, 3km to …
High concentrations of ozone in the troposphere are toxic and act as a greenhouse gas. Anthropogenic emissions of ozone precursors have caused widespread increases in ozone concentrations since the late 1800s, with the fastest-growing ozone precursor emissions currently coming out of east Asia. Much of the springtime east Asian pollution …
Springtime ozone levels in the lower atmosphere over western North America are rising. The source of this pollution may be Asia, a finding that reaffirms the need for international air-quality control.
The U.S. is strongly considering regulating hydrofluorocarbons (HFCs) due to their global climate change forcing effects. A drop-in replacement hydrofluoroether has been evaluated using a gate-to-grave life cycle assessment of greenhouse gas emissions for the trade-offs between direct and indirect carbon dioxide equivalent emissions compared to a current HFC and …
The Centre on Wednesday announced that both industrial and residential areas will not have different standards for air quality norms. In a major move to bring down the air pollution levels, the Centre unveiled tougher new air quality norms. The revised guidelines have added five more hazardous chemicals in the …
The Ministry of Environment and Forests (MoEF) has notified the Revised National Ambient Air Quality Standards (NAAQS), 2009, which provide a legal framework for control of air pollution and protection of public health. The revised norms have come 15 years after the Central Pollution Control Board (CPCB) had notified the …
Revised National Ambient Air Quality Standards 2009 released by the Ministry of Environment and Forests. As per these norms, the residential & industrial areas will have the same standards. Includes limits for benzene, ozone, benzopyrene, arsenic, nickel and ammonia not covered in 1994. See Also Document: National Ambient Air Quality …
Residents of the world's largest cities are ideally positioned to achieve the twin goals of clean air and lower carbon emissions, according to scientists in China and the US. The sheer density of populations in the world's 19 megacities
Pollution from carbon monoxide, nitrogen dioxide, sulphate and suspended particulate matter due to ignition of fireworks during the festival of Diwali is well established. Although surface ozone exhibits high natural variability throughout the year, any short term enhancement in ozone levels coupled with high level of pollutants during Diwali might …
The most commonly-known f-gases are the early, so-called first generation F-gases: the CFCs that destroyed the ozone layer and were banned by the Montreal Protocol. However, in the race to save the ozone layer, the use of their second generation cousins was accelerated: HCFCs, now also banned under the Montreal …
Breathing polluted air for even two hours can boost blood pressure, potentially raising the risk of cardiovascular disease in those exposed to smog, a new study suggests. Although the increase may not mean much for healthy people, "this small increase may actually be able to a trigger a heart attack …
The United Nations Secretary General (UNSG) in his message to commemorate the International Day for the Preservation of the Ozone Layer, on Wednesday, has urged for implementation of agreed environmental goals, targets and objectives for protection of the "Earth's Protective Shield." "Without action on climate change, the world faces profound …
