Plants produce pollen, a yellow powder to fertilize other plants. In many areas of the United States, pollen counts are the highest in February and early summer. Plants deliver pollen in the time of August to November in the fall and September is usually the worst month. You can use the apps like Weather Channel to check the pollen count of your area. It is better to stay at home with your windows closed. And, if you need to go outside then wear a mask and take a shower. Make sure to wash your hair to wash the pollen off.