Ambient fine particles and ozone exacerbate respiratory conditions including asthma

In New York City, age was a significant effect modifier for hospitalizations, and children age 6 to 18 years consistently had the highest risk.

Among children age 6 to 18 years, there was a 26% increased rate of ICU admissions and a 19% increased rate of general hospitalizations for each 12-mug/m(3) increase in PM(2.5). For each 22-ppb increase in ozone, there was a 19% increased risk for ICU admissions and a 20% increased risk for general hospitalizations.

Warm weather patterns of ozone and PM(2.5) disproportionately affect children with asthma and appear responsible for severe attacks that could have been avoided.

Age-related association of fine particles and ozone with severe acute asthma in New York City. Silverman RA, Ito K. J Allergy Clin Immunol. 2010 Feb;125(2):367-373.e5.
Association of ozone exposure with asthma, allergic rhinitis, and allergic sensitization
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