How asthmatic patients are allergic to plants?    

Example:
Mahesh Kumar has been suffering from asthma since childhood. He used to have asthma only during February-March every year. In these days he had to spend many sleepless nights. His doctor advised him skin allergy testing. 

Curiosity:  

• What was the reason for asthma of Mr. Mahesh?

• How was he cured?

He was allergic to Holoptelia plant which gives flowers during February. Mahesh had a Holoptelia tree near his house. He managed to get that tree removed. It resulted in significant improvement in his asthma.

Expert Comments:

Certain plants cause allergy in asthma patients. Patients should keep themselves away from these.
 

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• Keeping away from trees ,weeds and plants specially 
  in pollination season.
• Restrict your movements in the garden during pollination season or wear a mask and eye protection.
• Residing away from the farms and gardens.
• Sprinkling water reduces pollen load of the air. 
  Therefore sprinkle water just before sitting in 
  lawn during grass pollen season.
• Cutting of identified allergic trees may be done before flowering season.
• Offending pollens can be detected by allergy 
  testing and removing the particular plant 
  from the vicinity, is an efficient method of 
  protection & treatment.
• There is a machine called "Ionizer" which attract 
  pollens. It can be used to minimize pollen in the room.

• Use wet mask and eye protection during work. 
  (Mask protect you from pollens).

• Keep windows closed most of the time specially during pollination season.
• Wipe the floor twice with water. It will reduce 
  pollen load of the air.
• Pollen density becomes less in air-conditioned 
  room therefore AC is better.

• Before using  fans in the beginning of summer,
  get them, almirah, and other high places 
  cleaned with a wet cloth.

• Use face-mask and eye protection whilst dusting 
  your house because pollens settled on floor may
  enter in airway while brooming.
• Get floor wiped with a wet cloth, twice a day 
  during troublesome season.

• Use full mask helmet while riding on a scooter or 
  motor cycle.
• Alternatively use a mask or nasal filter during
   riding scooter or a bicycle.

In order to establish whether an asthma patient is allergic to pollens, and if so to which pollens, detailed investigations are necessary. First of all, it is necessary to find out which plants- trees, shrubs, grasses and weeds- are present in the area. This needs surveying, identification and cataloguing of all the plants that grow throughout the year or in any one particular season. The next step is to ascertain which pollens are present in the air in the area under study different months of the year. This is done by exposing to the air Vaseline-coated glass slides, placed in an instrument called pollen-catcher. The pollen-catcher is placed on top of a building, in different localities, where there is a free flow of air. The pollens present in the air, on passing over the slides, get caught in the Vaseline. These slides are then examined under a microscope and the type and the number of different pollens are counted. This is done daily, throughout the year, and for three to 
five years. From these extensive observations, one comes to know: 1) the types of pollens present, 2) the month in which they are present and 3) their respective quantities. Thus, one can chart out a pollen calendar for the area. Knowledge of pollen calendar of an area is absolutely necessary for investigating a case of asthma. If, for instance, an asthma patient says that he gets symptoms in the month of March and April only, it is necessary that we know which pollens are present in the air during these two months.