There is no definitive answer to this question as it depends on the individual and their specific allergies or asthma. Some people may find that certain airborne particles can trigger an allergic reaction or an asthma attack, while others may not be affected at all. It is therefore difficult to say whether or not it is harmful to people with allergies or asthma in general. However, if you suffer from either of these conditions, it is always best to err on the side of caution and take steps to avoid exposure to any potential triggers.