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2. The 10 Cities With the World's Worst Air - AOL

   www.aol.com/news/2010-11-29-10-cities-with...

   The Air Pollution Index, which rates the likelihood of people getting ill from breathing a city's air, has recently reached 500, the highest possible level, for multiple parts of Hong Kong.

3. Air pollution - Wikipedia

   en.wikipedia.org/wiki/Air_pollution

   Air pollution can occur naturally or be caused by human activities. [4] Air pollution causes around 7 or 8 million deaths each year. [5] [6] It is a significant risk factor for a number of pollution-related diseases, including heart disease, stroke, chronic obstructive pulmonary disease (COPD), asthma and lung cancer.

4. Air pollution in the United States - Wikipedia

   en.wikipedia.org/wiki/Air_pollution_in_the...

   Looking down from the Hollywood Hills, with Griffith Observatory on the hill in the foreground, air pollution is visible in downtown Los Angeles on a late afternoon.. Air pollution is the introduction of chemicals, particulate matter, or biological materials into the atmosphere that cause harm or discomfort to humans or other living organisms, or damage ecosystems.

5. Nearly 40% of people in the US live with unhealthy air ... - AOL

   www.aol.com/nearly-40-people-us-live-040127074.html

   The number of people living with levels of air pollution that can significantly affect their health climbed from about 119 million in last year’s data to 131 ... “And they are suffering, first ...

6. List of countries by air pollution - Wikipedia

   en.wikipedia.org/wiki/List_of_countries_by_air...

   Air pollution can affect nearly every organ and system of the body, negatively affecting nature and humans alike. Air pollution is a particularly big problem in emerging and developing countries, where global environmental standards often cannot be met. The data in this list refers only to outdoor air quality and not indoor air quality, which ...

7. Air pollution killed 135 million people in last four decades ...

   www.aol.com/air-pollution-killed-135-million...

   The World Health Organization previously said the “combined effects of ambient air pollution and household air pollution” are associated with 6.7 million premature deaths worldwide every year.