PM 2.5

In a Bay Area first, new home construction in most of the region will be banned from having these heating devices installed as the result of a rule adopted unanimously by the Bay Area Air Quality Management District on Oct. 21.
Oct 23, 2015   San Jose Mercury News
The answer depends on location, according to previous studies on EVs. The study from NBER evaluated both gas and electric-powered vehicles to determine their effect on the environment. A surprising recommendation is a new road funding option.
Jul 1, 2015   CityLab
In this Sunday Review editorial, The New York Times applauds China's announcement that it will ban coal burning in the Beijing region by 2020, but warns that some solutions to air pollution will exacerbate climate change.
Aug 26, 2014   The New York Times
Though smoking is on the decline in China, lung cancer rates are rising. Twenty-year olds have joined seniors as likely patients, attributed to the toxic clouds containing particulates that regularly envelope China's eastern cities.
Dec 29, 2013   Los Angeles Times - World
Thanks to a Calif. law implemented in 2008 requiring ocean-going ships to switch from high-sulfur bunker fuel to cleaner fuels within 24 miles of the coast, Bay Area air quality significantly improved by reducing deadly particulate emissions.
Oct 9, 2013   BAAQMD News Release
In Beijing, the level of air pollution is the highest the monitors at the U.S. embassy have ever recorded since put in place in 2008. The pollution results from a combination of weather conditions and particulate matter - most from coal burning.
Jan 15, 2013   The New York Times - Environment