Air pollution and meteorological conditions significantly contribute to the worsening of allergic conjunctivitis: a regional 20-city, 5-year study in Northeast China.

Temporally, the interannual data shows that the annual average concentration of O 3 shows an increasing trend during the observation period, while the concentration of other atmospheric pollutants (i.e., PM 10 , PM 2.5 , SO 2 , NO x , and CO) exhibits a decreasing trend, fluctuating from year to year.

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The results show an increasing trend in the AC of average growth rate per annum 7.6%, with the highest incidence in the provincial capitals.

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