When you do mow your grass, wear a mask to filter out the pollen particles. When you are in your car, keep your windows closed and your air conditioning on re-circulate. At home keep your windows closed during peak hours of the day, and be sure to replace your heating/cooling air filters regularly. Obtain a High Efficiency Particulate Air (HEPA) filter.
Gray Hair and Baldness: Coconut oil is also beneficial for preventing baldness and gray hair. Try mixing Bhringraj or Eclipta Alba leaf juice with the oil and apply this on the scalp and hair. Coconut oil is widely available in the market.
When dealing with hair loss, you can apply coconut oil infused with Indian gooseberry, or amla, to encourage hair growth. It will help greatly with premature graying as well. Heat some coconut oil in a pan and cook dried amla pieces in it until they are charred. Strain and cool the oil.