*BC (black carbon) has been used in the AQHI calculation when available; BC data not available at all sites and times. 
Health Risk AQHI At Risk Population General Population
Low Risk 1 – 3 Enjoy your usual outdoor activities. Ideal air quality for outdoor activities.
Moderate Risk 4 – 6 Consider reducing or rescheduling strenuous activities outdoors if you are experiencing symptoms. No need to modify your usual outdoor activities unless you experience symptoms.
High Risk 7 – 10 Reduce or reschedule strenuous activities outdoors. Children and the elderly should also take it easy. Consider reducing or rescheduling strenuous activities outdoors if you experience symptoms.
Very High Risk 10+ Avoid strenuous activities outdoors. Children and the elderly should also avoid outdoor physical exertion. Reduce or reschedule strenuous activities outdoors, especially if you experience symptoms.

Health Vulnerability Statement

All communities included in this report are designated as “underserved” by MDEnviroScreen. Notably, Turner Station, Cheverly, Cedar Heights, Curtis Bay, and areas near HCNR, and HU-B are further classified as “overburdened,” meaning they face a cumulative impact of three or more environmental or health stressors.

Critical sensitive population indicators (75th Percentile or higher):

Due to these compounding health disparities and socio-environmental stressors, the reported Air Quality Health Index (AQHI) represents a conservative baseline; the actual risk to residents in the tracts mentioned above is likely higher than the index alone suggests.

MDEnviroScreen Map

Spatial distribution of overburdened communities via MDEnviroScreen.

AQHI Summary for All ARP Grant-funded Modulair Sensors (BC Adjusted)
Sensor Total_Hours Mean_AQHI Median_AQHI Max_AQHI Hours_High_Risk Min_AQHI
MOD_00536 - Cheverly 739 4 4 6 0 2
MOD_00537 - Turner Station North 739 5 4 8 32 2
MOD_00745 - Cedar Heights 739 4 4 7 22 1
MOD_00746 - HCNR 739 3 3 5 0 1
MOD_00747 - Turner Station South 739 4 4 8 10 1
MOD_00748 - Annapolis 738 3 3 7 3 1
MOD_00749 - HU - Beltsville 737 3 3 6 0 1
AQHI Summary at MDE Regulatory Monitors*
Monitor Total_Hours Mean_AQHI Median_AQHI Max_AQHI Hours_High_Risk Min_AQHI
HUB 649 2 2 5 0 1
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 665 3 3 6 0 1
Piney_Run 712 2 2 5 0 0
HCNR 713 3 3 5 0 1
*HCNR statistics are a hybrid of regulatory monitor data (PM2.5 & NO2) and sensor data (O3). 

The highest AQHI value recorded was 8, reached by sensor(s) MOD_00537 - Turner Station North ( 4 h) and MOD_00747 - Turner Station South ( 1 h)

Highest AQHI Sensor(s) and Hours at Maximum
Sensor Max_AQHI Hours_at_Max
MOD_00537 - Turner Station North 8 4
MOD_00747 - Turner Station South 8 1

Summary Statistics for MetOne Sensors (880nm)
Monitor Total Hours Mean 880 Median 880 Max 880 Min 880 Skew Kurtosis Hours ≥ 600 % Time ≥ 600 Hours ≥ 300 % Time ≥ 300
B19939 616 296.22 239.42 1482.943 67.47592 2.363640 8.750554 35 5.7 221 35.9
D11556 738 653.17 499.99 3636.159 91.43944 2.121594 5.688751 297 40.2 599 81.2
D11559 738 423.17 351.69 2121.793 28.07667 2.154283 7.332381 144 19.5 435 58.9
D14645 738 794.60 558.84 5094.639 113.90833 2.228971 7.393018 344 46.6 609 82.5
D14648 738 769.58 505.85 7959.419 102.06278 3.603394 18.644907 303 41.1 580 78.6

Concentration Statistics Matrix
Station Pollutant Mean Median MAD Max (Outlier Check) Skew Kurtosis Valid Obs
Annapolis co 743.05 731.06 63.39 1343.64 1.66 6.92 739
Annapolis no 2.11 1.92 0.45 5.42 1.57 3.50 739
Annapolis no2 16.26 13.54 10.83 39.8 0.47 -1.06 739
Annapolis o3 25.15 22.68 16.56 63.18 0.39 -0.83 739
Annapolis pm1 7.23 6.84 4.16 23.75 0.70 0.21 739
Annapolis pm10 13.51 12.53 6.46 37.78 0.78 0.24 739
Annapolis pm25 7.86 7.37 4.34 24.81 0.71 0.02 739
Cedar Heights co 778.92 762.22 86.65 1476.24 0.98 2.76 740
Cedar Heights no 2.33 2.02 0.54 16.68 6.03 49.72 740
Cedar Heights no2 19.08 16.81 14.02 44.33 0.33 -1.17 740
Cedar Heights o3 25.70 23.22 17.69 72.06 0.43 -0.72 740
Cedar Heights pm1 9.46 8.33 4.34 69.06 4.02 25.28 739
Cedar Heights pm10 16.52 14.00 5.67 76 2.52 9.34 739
Cedar Heights pm25 10.12 8.72 4.32 70.12 3.72 22.24 739
Cheverly co 476.09 459.01 64.94 847.78 1.13 1.82 739
Cheverly no 2.09 1.91 0.33 4.45 1.47 2.52 739
Cheverly no2 14.29 11.09 8.39 51.06 0.75 -0.49 739
Cheverly o3 39.48 39.72 15.43 71.8 -0.02 -0.76 739
Cheverly pm1 11.62 10.42 5.62 88.54 3.92 28.01 740
Cheverly pm10 23.25 19.73 8.38 213.07 4.93 52.93 740
Cheverly pm25 12.42 11.00 5.86 90.08 3.61 24.55 740
HCNR co 832.16 822.15 110.38 1298.56 0.45 0.27 740
HCNR no 2.56 2.21 0.58 34.79 10.02 145.24 740
HCNR no2 14.25 10.78 6.82 43.69 1.12 0.11 740
HCNR o3 22.61 20.72 19.81 55.92 0.29 -1.17 740
HCNR pm1 7.53 7.53 4.38 25.81 0.35 -0.18 740
HCNR pm10 16.18 14.93 6.47 66.19 1.60 4.66 740
HCNR pm25 8.46 8.24 4.62 27.21 0.43 -0.25 740
HU - Beltsville co 729.28 719.14 75.70 1398.29 1.11 4.88 740
HU - Beltsville no 2.15 2.07 0.49 7.2 2.06 14.59 740
HU - Beltsville no2 14.61 10.93 7.46 41.24 0.92 -0.20 740
HU - Beltsville o3 23.60 19.86 21.06 69.3 0.39 -0.93 740
HU - Beltsville pm1 7.52 7.11 4.64 52.72 1.89 14.19 738
HU - Beltsville pm10 48.56 15.77 7.32 3035.34 8.87 90.17 738
HU - Beltsville pm25 8.52 7.98 5.04 54.16 1.68 11.48 738
Turner Station North co 493.68 481.49 66.88 880.52 1.10 2.12 740
Turner Station North no 2.16 2.00 0.48 7.56 2.12 11.07 740
Turner Station North no2 14.59 11.72 8.93 46.44 0.67 -0.59 740
Turner Station North o3 42.49 42.23 12.51 80.54 0.33 0.00 740
Turner Station North pm1 12.02 11.37 7.13 64.7 1.32 5.34 740
Turner Station North pm10 22.83 20.63 9.35 103.26 1.83 5.41 740
Turner Station North pm25 13.20 12.26 7.46 67.35 1.26 3.97 740
Turner Station South co 613.36 601.04 59.65 1128.78 1.46 5.17 739
Turner Station South no 2.21 1.97 0.54 10.98 3.19 20.89 739
Turner Station South no2 14.82 11.59 9.24 42.46 0.69 -0.75 739
Turner Station South o3 33.09 30.90 14.46 71.3 0.50 -0.33 739
Turner Station South pm1 7.58 7.21 5.02 33.62 0.84 1.35 740
Turner Station South pm10 24.23 20.06 10.78 111.48 2.07 6.21 740
Turner Station South pm25 8.47 7.91 5.12 35.93 0.87 1.03 740