Editing Philadelphia (section)

=== Time Series ===
{{Graph:Weather monthly history
| table=Ncei.noaa.gov/weather/Philadelphia.tab
| title=Philadelphia monthly weather statistics
}}

====Air quality====
Philadelphia County received an [[ozone]] grade of F and a 24-hour [[Particulates|particle pollution]] rating of D in the [[American Lung Association]]'s 2017 State of the Air report, which analyzed data from 2013 to 2015.<ref name=ala>{{cite web |url=http://www.lung.org/our-initiatives/healthy-air/sota/key-findings/methodology-and-acknowledgements.html |title=State of the Air 2017 – Methodology and Acknowledgements |publisher=American Lung Association |access-date=December 8, 2017 |archive-url=https://web.archive.org/web/20171208052851/http://www.lung.org/our-initiatives/healthy-air/sota/key-findings/methodology-and-acknowledgements.html |archive-date=December 8, 2017 |url-status=dead }}</ref><ref name=ala2>{{cite web |url=http://www.lung.org/our-initiatives/healthy-air/sota/city-rankings/states/pennsylvania/philadelphia.html |title=Philadelphia County – State of the Air 2017 |publisher=American Lung Association |access-date=December 7, 2017 |archive-date=December 7, 2017 |archive-url=https://web.archive.org/web/20171207070041/http://www.lung.org/our-initiatives/healthy-air/sota/city-rankings/states/pennsylvania/philadelphia.html |url-status=live }}</ref> The city was ranked 22nd for ozone, 20th for short-term particle pollution, and 11th for year-round particle pollution.<ref name=ala3>{{cite web |url=http://www.lung.org/our-initiatives/healthy-air/sota/city-rankings/most-polluted-cities.html |title=Most Polluted Cities |publisher=American Lung Association |access-date=December 8, 2017 |archive-date=July 28, 2017 |archive-url=https://web.archive.org/web/20170728191912/http://www.lung.org/our-initiatives/healthy-air/sota/city-rankings/most-polluted-cities.html |url-status=live }}</ref> According to the same report, the city experienced a significant reduction in high ozone days since 2001—from nearly 50 days per year to fewer than 10—along with fewer days of high particle pollution since 2000—from about 19 days per year to about 3—and an approximate 30% reduction in annual levels of particle pollution since 2000.<ref name=ala2/>

Five of the ten largest [[Combined statistical area#List of combined statistical areas|combined statistical areas]] (CSAs) were ranked higher for ozone: Los Angeles (1st), New York City (9th), [[Houston]] (12th), [[Dallas]] (13th), and [[San Jose, California]] (18th). Many smaller CSAs were also ranked higher for ozone, including [[Sacramento, California|Sacramento]] (8th), [[Las Vegas]] (10th), [[Denver]] (11th), [[El Paso, Texas|El Paso]] (16th), and [[Salt Lake City]] (20th). Only two of those same ten CSAs, San Jose and Los Angeles, were ranked higher than Philadelphia for both year-round and short-term particle pollution.<ref name=ala3/>