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Air pollution is killing thousands of people around the world every day. Cities across Asia and Europe have had to shut down and stop traffic to manage times when the air is unsafe. But air pollution is a killer everywhere, even places we think of as safe. How dangerous is the pollution we can鈥檛 even see?

New scientific research is showing the answers may be worse than we feared. A rise in dementia among dogs in heavily-polluted Mexico City led to a shocking discovery: microscopic particles of air pollution can travel from nerve cells in our noses directly into our brains.

In 2017, a study of 6.5 million Ontario health records confirmed that the closer you live to a major highway, the higher your odds of contracting dementia. Further research from USC in Los Angeles revealed that these airborne particulates actually shrink the brain, get into the bloodstream and even into the womb.

Nochdaidh RUDEIGIN SAN 脠ADHAR gu bheil truailleadh 猫adhair a' marbhadh na m矛ltean air feadh an t-saoghail gach latha. Feumaidh bailtean air feadh 脌isia is na Roinn E貌rpa d霉nadh s矛os agus trafaig a stad nuair nach eil an 猫adhar s脿bhailte. Ach tha truailleadh 猫adhair marbhtach anns gach ce脿rn, eadhon an 脿iteachan a shaoileadh sinn a bhiodh s脿bhailte. D猫 cho cunnartach 's a tha an truailleadh nach fhaic sinn?

Tha rannsachadh 霉r a' sealltainn gur d貌cha gu bheil c霉isean nas miosa na bha d霉il. Fhuaireadh lorg air rud uabhasach ri linn 脿rdachadh seargadh-eanchainn ann an coin ann am Baile Mheagsago: 's urrainn dha meanbh-mh矛rean san 猫adhar an eanchainn a ruighinn tro nearbhan nan sr貌n.

A r猫ir rannsachadh ann an 2017 air 6.5 millean cl脿r-sl脿inte ann an Ontario mar as fhaisge a tha neach a' fuireach air m貌r-rathad, 's ann as dualtaiche a tha iad fulang seargadh-inntinn. Nochd rannsachadh bho USC ann an Los Angeles gum bi na m矛rean sin a' seacadh na h-eanchainn, a' dol a shruth na fala agus fi霉 's dhan bholg.

Dubbed in Gaelic with English subtitles