Pollen is moderate in Bolton today.

Hayfever sufferers in Bolton should track all three pollen types from March through August.

Tree pollen here is dominated by silver birch, oak and alder, with grass led by ryegrass and cocksfoot and weeds by nettle.

Tree pollen typically peaks in April. Grass counts are highest from June into early July. Damper conditions can suppress airborne grains, but birch can spike sharply on dry April days.

For the wider regional view see North West England.