To reduce the exposure to air pollution, indoor and outdoor one can check the quality of air at his location. To reduce inside or indoor one should clean the house frequently to avoid the growth of mold or prevent dust in the house.
For outdoor, using cars, bikes, and other fuel-based transport vehicles can lead to an increase in air pollution so one should use walking or mechanical transport means. Industrialized chimneys produce harmful carbon and nitrogen gases which should be limited to reduce.
The risks are they could be injecting themselves with something their allergic to, they should either walk away from the situation and say no and if that's not an option make up an excuse.
