The most stomach-turning example is Mexico City in the late 1990s, when the inner city had more than two million stray dogs depositing 353 tonnes of dog poo a day: the PM10 in the air was found to include ‘dog dust’ – particles of dried faecal matter. As the LA Times nauseously put it in 1999, ‘The dog dust and other particulates settle on the tortillas, tamales and salsa being served up to customers at the open-air stands, feeding chronic intestinal miseries.’
PM10 shit particles
