Pollen Alerts For San Luis Obispo, CA

Pollen Index: 9.5 Pollen Level: medium-high Predominant Pollen: Poplar/Aspen/Cottonwood, Oak and Cedar/Juniper. The quantity of pollen grains in the air for Wednesday will be on the increase in the high range. This higher level is caused in part by seasonally normal weather conditions which are favorable for the production and dispersal of pollen.