Mild
Mild pollen — sensitive individuals may notice
Grass pollen is the main trigger · Tomorrow → · Updated 11 hours ago
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Pollen levels in Los Angeles are currently low. Most people should not experience allergy symptoms from pollen.
Tree pollen: Very Low. Grass pollen: Moderate. Weed pollen: None.
Pollen conditions in Los Angeles are expected to remain similar tomorrow.
Los Angeles presents a year-round allergy challenge, shaped by its mild Mediterranean climate, extended growing seasons, and a basin geography that traps airborne particles against the surrounding mountains.
Tree pollen kicks off the heaviest allergy season, typically from February through May, with olive, oak, sycamore, mulberry, ash, and non-native juniper and cypress among the most potent local offenders. Olive and mulberry trees are so problematic that certain varieties are restricted by city ordinance.
As trees taper off, grass pollen takes over from late April through July, with Bermuda, rye, Kentucky bluegrass, and Johnson grass driving symptoms; Bermuda in particular can linger well into fall thanks to LA's warm temperatures.
Weed season follows in late summer and autumn, dominated by ragweed, sagebrush, pigweed, Russian thistle (tumbleweed), and lamb's quarters, often peaking from August through October. Overlapping grass and weed activity in late summer can intensify reactions.
Beyond pollen, Angelenos contend with persistent dust, outdoor mold spores thriving in irrigated landscapes, wildfire smoke, and some of the nation's highest ozone and particulate pollution, all worsened by dry Santa Ana winds.
Overall, Los Angeles's allergy profile is defined by a long, overlapping pollen calendar amplified by pollution and stagnant basin air.