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 …
Ozone technology has been used for the past two decades or more. It is, however, only now that its use in wastewater treatment has been recognized. The location of ozone use in wastewater treatment determines the goal of treatment. At the same time, ozone finds use in each stage of …
Ozone pollution is produced by photochemical processes involving nitrogen oxides and volatile organic compounds in the lower atmosphere. Ozone levels become particularly high in regions close to high ozone precursor emissions during summer episodes with stagnant meteorological conditions, when high insolation and temperatures persist. In 2008, levels continued to exceed …
Environmental air pollutants are inhaled as complex mixtures, but the long dominant focus of monitoring and research on individual pollutants has provided modest insight into pollutant interactions that may be important to health. Trends toward managing multiple pollutants to maximize aggregate health gains place increasing value on knowing whether the …
The development of modern biofuels for various energy applications is gaining momentum - both in terms of applications and impacts. Liquid biofuels for transport received special attention in the literature and numerous studies on the sustainability (economic and environmental) of large-scale biofuels production continue to be undertaken. This includes large …
Resulting from the enhanced micro-flocculation effect of ozone the filtration rates can be increased, smaller filtration beds used and even the chemical consumption lowered.
Surface ozone variability at Pune (an urban location) and nearby rural locations has been studied using KI solution chemical method. The measurement showed well-marked diurnal cycle of ozone concentration with minimum at sunrise and maximum at noon hours. Simultaneous measurements of humidity and temperature along with ozone suggest that the …
New Delhi: High concentration of ground level ozone is fast threatening the health of Delhiites. According to several studies, the level of the pollutant, formed when ultraviolet rays react with pollutants, specially NOx, has risen significantly in the city over the past few years. The Central Road and Research Institute …
Atmospheric nitrogen oxides (NOx =NO+ NO2) play a pivotal role in the cycling of reactive nitrogen (ultimately deposited as nitrate) and the oxidative capacity of the atmosphere. Combined measurements of nitrogen and oxygen stable isotope ratios of nitrate collected in the Arctic atmosphere were used to infer the origin and …
Global climate change has resulted primarily from the accumulation of carbon dioxide (CO2) and other greenhouse gases (GHGs) in the atmosphere over the last 150 years. However, recent studies indicate that, on average, 40 per cent of the potential warming by GHGs is being masked by certain aerosols (and aerosol-cloud …
Current day concentrations of ground level ozone (O3) are commonly reducing crop yields by between 5 and 35 % at agriculturally important locations across South Asia. O3 induced economic crop losses could be in the region of $4 billion per annum for staple crops in South Asia; such losses are …
AHMEDABAD: Focusing on the harmful effects of ozone layer depletion, the Gujarat Council of Science City (GCSC), Department of Science & Technology, Government of Gujarat will, on Tuesday, organise various activities as a part of Ozone Awareness Programme to mark the 'International Day for Preservation of the Ozone Layer' on …
Poverty is a major determinant of population health, but little is known about its role in modifying air pollution effects. The researchers set out to examine whether people residing in socially deprived communities are at higher mortality risk from ambient air pollution.
Petrochemicals are hydrocarbons, obtained from naturally occurring raw materials viz. petroleum, natural gas, coal etc. Coal was initially the basic raw material for organic chemical industry. However the basic feedstock has changed recently from coal to petroleum. This is attributed to the recent innovation and technological advance in the field …
Various factors can modify the health effects of outdoor air pollution. Prior findings about modifiers are inconsistent, and most of these studies were conducted in developed countries. The researchers conducted a time-series analysis to examine the modifying effect of season, sex, age, and education on the association between outdoor air …
Over the past several decades, satellite surveillance with increasingly sophisticated instruments has enabled scientists to better visualize the complex fluctuations of several pollutants as they make their way around the Earth. One aspect of this research has focused on directly correlating satellite-observed concentrations of pollutants in the atmosphere with those …
This study examines the annual, seasonal and diurnal variations in the ambient concentrations of ozone at a suburban site of Varanasi, India, during 2002-2006. Prominent seasonal variations in ozone concentrations were recorded. Ozone concentrations were higher during the warmer months. Daytime 12-hourly mean monthly ozone concentrations varied from 45.18 to …
After a decade of deliberations and review of more than 1,700 new studies, the U.S. Environmental Protection Agency (EPA) announced the new primary standard for ground-level ozone in March 2008. The new standard, 75 ppb, is being assailed from all sides
It is now common knowledge that the Montreal Protocol in its effort to phase out the use of ozone depleting substances, especially CFCs, also alleviated the growing climate problem significantly. Some say the world was given a grace period of 10 years in which to react to the potentially cataclysmic …
The Montreal Protocol with its subsequent amendments and adjustments has been providing a global regulatory framework for the phase out of ozone depleting substances. Till date, CFCs, CTC, HBFCs, methyl chloroform and halons have been already phased out completely by the developed countries and a number of other ODSs are …
