Editing Pyrethroid (section)

===Environmental effects===
Pyrethroids are toxic to insects such as [[bee]]s, [[dragonflies]], [[mayflies]], [[Horse-fly|gadflies]], and some other [[invertebrates]], including those that constitute the base of aquatic and terrestrial [[food webs]].<ref name=dc/> They are toxic to aquatic organisms including fish.<ref name=idph/>

Pyrethroids are usually [[Chemical decomposition|broken apart]] by [[sunlight]] and the atmosphere in one or two days, however when associated with sediment they can persist for some time.{{better reference|date=October 2024}}<ref>{{cite journal |doi=10.1371/journal.pone.0015794 |pmid=21246035 |pmc=3016336 |title=Environmental Modeling and Exposure Assessment of Sediment-Associated Pyrethroids in an Agricultural Watershed |journal=[[PLOS ONE]]|volume=6 |issue=1 |pages=e15794 |year=2011 |last1=Luo |first1=Yuzhou |last2=Zhang |first2=Minghua |bibcode=2011PLoSO...615794L |doi-access=free }}</ref>

Pyrethroids are unaffected by conventional secondary treatment systems at municipal [[wastewater treatment]] facilities. They appear in the effluent, usually at levels lethal to invertebrates.{{better reference|date=October 2024}}<ref name="weston">{{cite journal |doi=10.1021/es9035573 |pmid=20121184 |title=Urban and Agricultural Sources of Pyrethroid Insecticides to the Sacramento-San Joaquin Delta of California |journal= [[Environmental Science & Technology]] |volume=44 |issue=5 |pages=1833–40 |year=2010 |last1=Weston |first1=Donald P |last2=Lydy |first2=Michael J |bibcode=2010EnST...44.1833W }}</ref>