Editing Heat wave (section)

=== Surface ozone (air pollution) ===
{{Further|Ozone#Ozone air pollution|Ozone#Low level ozone in urban areas}}High temperatures also make the effects of [[ozone]] pollution in urban areas worse. This raises heat-related mortality during heat waves.<ref>{{Cite journal |last1=Diem |first1=Jeremy E. |last2=Stauber |first2=Christine E. |last3=Rothenberg |first3=Richard |date=2017-05-16 |editor-last=Añel |editor-first=Juan A. |title=Heat in the southeastern United States: Characteristics, trends, and potential health impact |journal=PLOS ONE |volume=12 |issue=5 |pages=e0177937 |bibcode=2017PLoSO..1277937D |doi=10.1371/journal.pone.0177937 |issn=1932-6203 |pmc=5433771 |pmid=28520817 |doi-access=free}}</ref> During heat waves in urban areas, ground level ozone pollution can be 20 percent higher than usual.<ref>{{Cite journal |last1=Hou |first1=Pei |last2=Wu |first2=Shiliang |date=July 2016 |title=Long-term Changes in Extreme Air Pollution Meteorology and the Implications for Air Quality |journal=Scientific Reports |volume=6 |issue=1 |pages=23792 |bibcode=2016NatSR...623792H |doi=10.1038/srep23792 |issn=2045-2322 |pmc=4815017 |pmid=27029386}}</ref>

One study looked at fine particle concentrations and ozone concentrations from 1860 to 2000. It found that the global population-weighted fine particle concentrations increased by 5 percent due to climate change. Near-surface ozone concentrations rose by 2 percent.<ref>{{Cite journal |last1=Orru |first1=H. |last2=Ebi |first2=K. L. |last3=Forsberg |first3=B. |date=2017 |title=The Interplay of Climate Change and Air Pollution on Health |journal=Current Environmental Health Reports |volume=4 |issue=4 |pages=504–513 |doi=10.1007/s40572-017-0168-6 |issn=2196-5412 |pmc=5676805 |pmid=29080073|bibcode=2017CEHR....4..504O }}</ref>

An investigation to assess the joint mortality effects of ozone and heat during the European heat waves in 2003 concluded that these appear to be additive.<ref>{{cite journal |author=Kosatsky T. |date=July 2005 |title=The 2003 European heat waves |url=http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=552 |journal=Eurosurveillance |volume=10 |issue=7 |pages=3–4 |doi=10.2807/esm.10.07.00552-en |pmid=29208081 |access-date=14 January 2014 |doi-access=free}}</ref>