The items that most likely contribute to asthma are ozone and particulate matter. Both ozone and particulate matter can exacerbate respiratory conditions, including asthma, by causing inflammation and reducing lung function.
While nitrogen oxides can also contribute to respiratory issues, ozone and particulate matter are more commonly associated with asthma exacerbations. Carbon monoxide is less directly linked to asthma compared to the other pollutants mentioned.
Therefore, the best response is ozone and particulate matter.