The city's efforts, beginning in the early 1990s, have had dramatic effects, particularly on the main focus of Santiago Respira: PM2.5.
ຄວາມພະຍາຍາມຂອງນະຄອນ, ເລີ່ມຕົ້ນໃນ 1990s ຕົ້ນ, ມີຜົນກະທົບຢ່າງຫຼວງຫຼາຍ, ໂດຍສະເພາະແມ່ນຈຸດສຸມຕົ້ນຕໍຂອງ Santiago Respira: PM2.5.