The world's cities are choking on pollution from traffic and industry. With the health of over 1.6 billion people under threat, poor urban air quality is fast becoming one of them most pressing environmental problems of our times. Smog Alert examines the causes and scale of urban air pollution, identifying who is most at risk, and what particular health risks various pollutants pose. It then considers an effective framework for air quality management, so that national and city authorities can consider what pollution control polices and measures are needed to deliver healthy urban air quality, and to sustain it in the future. Having established the background and framework, the book examines the existing and alternative measures to monitor and combat the declining air quality. It assesses smog alert systems; the potential for cleaner car and fuel technology; sustainable traffic management and public transport policies; and methods of controlling both industrial and residential emissions. Detailed case studies illustrate the severity and breadth of the problem - from the first serious photochemical smogs in Los Angeles to the dire warning offered by Mexico City; and from London (the city which coined the word 'smog') to Athens' pollution phenomenon, the 'nefos'. Drawing on the lessons learned from past experience, Smog Alert provides a comprehensive analysis of how health air quality may yet be achieved in the world's cities.

The main objective of these updated global guidelines is to offer health-based air quality guideline levels, expressed as long-term or short-term concentrations for six key air pollutants: PM2.5, PM10, ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide. In addition, the guidelines provide interim targets to guide reduction efforts of these pollutants, as well as good practice statements for the management of certain types of PM (i.e., black carbon/elemental carbon, ultrafine particles, particles originating from sand and duststorms). These guidelines are not legally binding standards; however, they provide WHO Member States with an evidence-informed tool, which they can use to inform legislation and policy. Ultimately, the goal of these guidelines is to help reduce levels of air pollutants in order to decrease the enormous health burden resulting from the exposure to air pollution worldwide.

This book presents WHO guidelines for the protection of public health from risks due to a number of chemicals commonly present in indoor air. The substances considered in this review, i.e. benzene, carbon monoxide, formaldehyde, naphthalene, nitrogen dioxide, polycyclic aromatic hydrocarbons (especially benzo[a]pyrene), radon, trichloroethylene and tetrachloroethylene, have indoor sources, are known in respect of their hazardousness to health and are often found indoors in concentrations of health concern. The guidelines are targeted at public health professionals involved in preventing health risks of environmental exposures, as well as specialists and authorities involved in the design and use of buildings, indoor materials and products. They provide a scientific basis for legally enforceable standards.

Does the solution to our energy crisis depend upon the de velopment of coal, nuclear, solar, or some other energy source? Are we better off because science and technology have made us less vulnerable to natural catastrophes? How, in fact, do we see ourselves now in relation to our natural world? The answers to these questions lie as much within the humanities as in the sciences. Problems as seemingly unrelated as our vulnerability to OPEC oil price hikes or a smog alert in Los Angeles or Tokyo often have common, hidden causes. One of these causes is simply the way our society sees its place in nature. There are many reasons for the heavy demand for oil. Among these we vii viii I PREFACE can include desire for industrial growth, hopes for improved living standards, mobility through automobiles and rapid transportation systems, and, not least, an attempt to loosen the constraints on man imposed by nature. These constraints and man's concomitant dependence upon nature are exam ples of the intense and finely interwoven relationship be tween man and nature, a relationship that constitutes a pri mordial bond forged long before the era of modem technology. Similarly, man has explored this primordial bond through the humanities for all the centuries prior to our present techno logical age. As we will see in this exploration, the bond un derlies many of the environmental and technological prob lems we have come to label the ecological crisis.

The Earthshot concept is simple: Urgency + Optimism = Action. We have ten years to turn the tide on the environmental crisis, but we need the world's best solutions and one shared goal - to save our planet. It's not too late, but we need collective action now. The Earthshots are unifying, ambitious goals for our planet which, if achieved by 2030, will improve life for all of us, for the rest of life on Earth, and for generations to come. They are to: · Protect and Restore Nature · Clean our Air · Revive our Oceans · Build a Waste-Free World · Fix our Climate EARTHSHOT: HOW TO SAVE OUR PLANET is the first definitive book about how these goals can tackle the environmental crisis, from rainforests to coral reefs, via wilderness, cities and in our own homes. It is a critical contribution to the most important story of the decade.