![Photograph of a town in Ireland, in a valley](https://cdn.sanity.io/images/e1gxlr8g/production/098efc9eb8ae08d6b8d6655dba5a69ea8acc247d-5467x3645.jpg?w=200&h=200)
Primary pollutant: Ozone (O3): Ground-level ozone, like smog. Could worsen breathing issues for those with hay fever and asthma.
Mayo Pollen Count is High .
* μg/m^3 = microgram per cubic meter
** ppb = parts per billion
*** ppm = parts per million