The dense smog which had been throttling Delhi for the past few days has lifted partially today, but it may come back with renewed vigour, as the factors causing it remain in force - warns Centre for Science and Environment (CSE).

Exposure to ozone has been associated with adverse health effects, including premature mortality and cardiopulmonary and respiratory morbidity. In 2008, the U.S. Environmental Protection Agency (EPA) lowered the primary (health-based) National Ambient Air Quality Standard (NAAQS) for ozone to 75 ppb, expressed as the fourth-highest daily maximum 8-hr average over a 24-hr period. Based on recent monitoring data, U.S. ozone levels still exceed this standard in numerous locations, resulting in avoidable adverse health consequences.

Microscopic particles, among the most harmful forms of air pollution, are still found at dangerous levels in Europe, although law has cut some toxins from exhaust fumes and chimneys, a European Env

The World Meteorological Organization (WMO) and the International Global Atmospheric Chemistry (IGAC) project have released a report, titled “Impacts of Megacities on Air Pollution and Climate.” The report provides an initial assessment of available information on air pollution and climate impacts in megacities globally.

Climate scientists at the Harvard School of Engineering and Applied Sciences (SEAS) have discovered that particulate pollution in the late 20th century created a "warming hole" over the eastern Uni

The House of Representatives passed a bill on Thursday to delay Environmental Protection Agency limits on pollutants from industrial boilers, its latest move to hinder air rules designed to protect

President Obama abandoned a contentious new air pollution rule on Friday, buoying business interests that had lobbied heavily against it, angering environmentalists who called the move a betrayal a

Indian wind turbine company Suzlon Energy Ltd. will pay a $490,000 penalty for pollution violations in the U.S.

This, the first systematic study, quantifies the health effects of air quality regulations in Delhi, which adopted radical measures to improve air quality, including, for example, the conversion of all commercial vehicles to compressed natural gas (CNG), and the closure of polluting industries in residential areas from 2000 to 2002.

Attempts to halt and reverse a decade of worsening air quality in London are being held up by political indecision. After steady rises in air quality up until the turn of the century, London should be well on the way to tackling one of the most serious public health concerns today.