Associations of Air Pollution and Pediatric Asthma in Cleveland, Ohio

Table 1

Prevalence of population-adjusted pediatric emergency department visits for asthma, based on home location-based air quality levels.

LUR subset	Mean number of ED visits/100,000 people
Coarse PM Q1 (0–6.4 μg m^−3)	1.46
Coarse PM Q2 (6.4–7.8 μg m^−3)	1.25
Coarse PM Q3 (7.8–9.6 μg m^−3)	1.96
Coarse PM Q4 (9.6–22 μg m^−3)	2.62
NO2 Q1 (3.0–13 ppb)	1.16
NO2 Q2 (14–15 ppb)	1.47
NO2 Q3 (15–17 ppb)	2.16
NO2 Q4 (17–27 ppb)	2.22