Uber can make the lives of asthma and allergies sufferers much more comfortable by asking their drivers to avoid synthetic air fresheners in their cars. Synthetic fragrance chemicals can trigger severe reactions, reactions which can be avoided by the use of natural plant-based fragrances. Please ask Uber to keep allergy sufferers safe by regulating synthetic air fresheners in their fleets. I think the change will be a "breath of fresh air" for all Uber passengers.