The exposure to air pollution from living in a city can be equated to number of cigarettes in terms of cancer risks. Living in San Francisco is about 1/3 cigare

The exposure to air pollution from living in a city can be equated to number of cigarettes in terms of cancer risks. Living in San Francisco is about 1/3 cigarette a day, with an average PM2.5 of around 8ug/m^3. https://www.citylab.com/environment/2018/04/how-much-are-you-smoking-by-breathing-urban-air/558827/ https://www.citylab.com/environment/2018/04/how-much-are-you... http://www.baaqmd.gov/~/media/files/communications-and-outreach/annual-bay-area-air-quality-summaries/pollsum2016-pdf.pdf http://www.baaqmd.gov/~/media/files/communications-and-outre...