Details in http://www.baaqmd.gov/~/media/Files/Planning%20and%20Research/CARE%20Program/Documents/ImpactCommunities_2_Methodology.ashx?la=en

In the US, exposure to very fine particulate matter known as PM2.5 is considered safe by the US Environmental Protection Agency’s national ambient air quality standards so long as a person breathes in an average of 12 micrograms per cubic meter of air (μg/m3) or less per day over the duration of a year. In the short term, the US considers it safe if PM2.5 levels don’t go over 35 μg/m3 within a day, so long as the yearly average comes out to 12 μg/m3 per day (in other words, a few days of higher PM2.5 here and there is acceptable, so long as there are only…

West Oakland Environmental Indicators Project (WOEIP)  http://www.woeip.org/ Coalition for Clean Air   http://www.ccair.org/ Family for Clean Air   http://www.familiesforcleanair.org/ Sunflower Alliance  https://www.sunflower-alliance.org/ Communities for a better environment   www.cbecal.org/ 350 Bay area  https://350bayarea.org/ Map Web Service: Real-time Air Quality Tile API http://aqicn.org/faq/2015-09-18/map-web-service-real-time-air-quality-tile-api/cn/

From International Journal of Molecular Sciences Abstract Air pollution of anthropogenic origin is largely from the combustion of biomass (e.g., wood), fossil fuels (e.g., cars and trucks), incinerators, landfills, agricultural activities and tobacco smoke. Air pollution is a complex mixture that varies in space and time, and contains hundreds of compounds including volatile organic compounds (e.g., benzene), metals, sulphur and nitrogen oxides, ozone and particulate matter (PM). PM0.1 (ultrafine particles (UFP)), those particles with a diameter less than 100 nm (includes nanoparticles (NP)) are considered especially dangerous to human health and may contribute significantly to the development of numerous respiratory and cardiovascular diseases such as…