*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 10556 4 4 10 54 1
MOD_00537 - Turner Station North 10417 4 4 10 281 1
MOD_00733 196 2 2 4 0 2
MOD_00745 - Cedar Heights 9480 4 4 10 108 1
MOD_00746 - HCNR 6170 4 4 6 0 1
MOD_00747 - Turner Station South 12419 4 4 8 56 1
MOD_00748 - Annapolis 10196 3 3 7 14 0
MOD_00749 - HU - Beltsville 5178 3 3 7 6 0
MOD_00760 4819 3 3 8 47 0
MOD_00824 - Curtis Bay 2675 3 3 5 0 1
AQHI Summary at MDE Regulatory Monitors*
Monitor Total_Hours Mean_AQHI Median_AQHI Max_AQHI Hours_High_Risk Min_AQHI
HUB 12218 2 2 5 0 0
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 8708 3 3 7 2 1
Piney_Run 12217 2 2 6 0 0
HCNR 5795 3 3 6 0 1
*HCNR statistics are a hybrid of regulatory monitor data (PM2.5 & NO2) and sensor data (O3). 

The highest AQHI value recorded was 10, reached by sensor(s) MOD_00536 - Cheverly ( 2 h) and MOD_00537 - Turner Station North ( 5 h) and MOD_00745 - Cedar Heights ( 1 h)

Highest AQHI Sensor(s) and Hours at Maximum
Sensor Max_AQHI Hours_at_Max
MOD_00536 - Cheverly 10 2
MOD_00537 - Turner Station North 10 5
MOD_00745 - Cedar Heights 10 1

Summary Statistics for MetOne Sensors (880nm)
Monitor Total_Hours Mean_880 Median_880 Max_880 Min_880 Skew Kurtosis Hours_Above_600 Hours_Above_300
B19939 9085 301.04 228.23 4825.180 0.000 2.690070 16.79270 1091 3409
C14446 2335 410.37 266.93 3286.814 35.005 2.729595 9.09589 438 1041
D11556 10366 513.11 343.93 8837.714 0.000 3.097310 16.89785 3035 5684
D11559 10994 315.51 210.53 6972.781 0.000 3.274304 22.05282 1668 4114
D14645 11503 730.67 481.88 10031.259 0.000 2.476018 10.95404 4773 7774
D14648 11959 586.77 390.58 7959.419 0.000 3.105564 15.27622 3845 7458
D14780 1254 141.01 0.00 3047.697 0.000 3.810908 17.99510 96 207
D14781 9117 488.58 327.20 8853.832 0.000 3.415811 21.71314 2331 4908

Concentration Statistics Matrix
Station Pollutant Mean Median MAD Max (Outlier Check) Skew Kurtosis Valid Obs
Annapolis co 767.38 740.04 57.11 1783.25 2.54 10.53 10243
Annapolis no 2.63 2.19 0.52 191.71 22.68 671.09 10064
Annapolis no2 21.50 25.05 8.55 51.6 -0.43 -1.09 10243
Annapolis o3 22.03 20.87 12.15 67.68 0.46 -0.20 10243
Annapolis pm1 4.70 3.63 2.71 80.17 3.29 38.14 10370
Annapolis pm10 14.08 9.64 5.96 6943.32 65.70 5267.01 10370
Annapolis pm25 5.31 4.31 3.05 81.52 3.04 33.18 10370
Cedar Heights co 797.20 762.59 77.20 2425.91 2.46 11.69 8793
Cedar Heights no 2.61 2.18 0.49 108.92 15.24 287.24 8789
Cedar Heights no2 22.63 26.00 8.07 51.46 -0.46 -0.90 8793
Cedar Heights o3 21.63 19.74 13.41 72.06 0.56 -0.18 8793
Cedar Heights pm1 6.74 5.48 3.83 142.65 6.20 99.29 8863
Cedar Heights pm10 14.97 11.37 6.19 2517.95 34.62 1360.25 8863
Cedar Heights pm25 7.27 6.02 4.02 144.95 6.02 95.21 8863
Cheverly co 498.29 459.37 64.86 1919.86 2.93 13.01 10656
Cheverly no 3.14 2.12 0.44 220.72 12.54 198.84 10625
Cheverly no2 18.24 20.22 8.97 52.11 -0.14 -0.94 10656
Cheverly o3 32.88 32.20 11.59 74.18 0.39 -0.10 10656
Cheverly pm1 8.00 6.55 4.73 114.3 4.47 54.14 10647
Cheverly pm10 18.85 13.75 9.39 4376.43 40.71 1988.43 10647
Cheverly pm25 8.51 7.07 4.89 115.96 4.36 52.33 10647
Curtis Bay co 721.89 654.25 71.30 4432.01 6.11 73.89 3227
Curtis Bay no 2.99 2.41 0.42 79.82 12.98 210.09 3227
Curtis Bay no2 10.51 10.16 3.83 27.81 0.77 0.63 3227
Curtis Bay o3 37.85 38.19 9.07 75.05 -0.21 0.05 3227
Curtis Bay pm1 3.74 2.06 2.58 27.54 1.79 3.79 2680
Curtis Bay pm10 10.52 3.83 4.90 276.88 3.80 26.69 2680
Curtis Bay pm25 4.08 2.43 2.91 30.63 1.69 3.24 2680
HCNR co 790.88 767.09 80.76 2050.87 1.45 5.95 6171
HCNR no 2.95 2.33 0.62 70.09 9.28 132.69 6171
HCNR no2 26.13 29.72 8.91 48.48 -0.60 -0.86 6171
HCNR o3 24.02 23.85 13.06 58.49 0.21 -0.62 6171
HCNR pm1 5.07 3.99 3.02 25.81 1.24 1.54 6176
HCNR pm10 21.03 10.79 6.60 3868.74 23.69 681.44 6176
HCNR pm25 5.74 4.61 3.34 27.21 1.22 1.45 6176
HU - Beltsville co 739.03 720.74 56.60 1398.29 1.55 4.31 5180
HU - Beltsville no 2.42 2.23 0.51 15.35 3.96 34.00 5180
HU - Beltsville no2 20.12 22.66 8.58 51.75 -0.18 -0.99 5180
HU - Beltsville o3 20.30 18.66 13.09 69.83 0.67 0.17 5180
HU - Beltsville pm1 5.20 4.07 3.04 52.72 1.68 6.37 5183
HU - Beltsville pm10 29.50 9.92 6.37 2912.87 12.17 168.70 5183
HU - Beltsville pm25 5.83 4.69 3.39 54.16 1.53 5.24 5183
MOD_00733 co 1089.64 1038.37 98.35 4502.59 4.96 66.82 1900
MOD_00733 no 2.70 2.11 0.46 68.46 10.99 135.12 1900
MOD_00733 no2 18.83 21.49 4.79 46.16 -0.62 -0.67 1900
MOD_00733 o3 29.66 29.86 7.01 98.9 0.70 4.87 1900
MOD_00733 pm1 1.32 0.36 0.30 52.68 7.62 63.36 197
MOD_00733 pm10 2.85 0.48 0.39 183.93 9.81 109.36 197
MOD_00733 pm25 1.66 0.38 0.31 56.21 6.51 44.66 197
MOD_00760 co 825.45 800.28 77.86 1650.69 1.54 4.10 4818
MOD_00760 no 2.44 2.10 0.45 120.53 19.60 450.45 4818
MOD_00760 no2 25.26 28.86 12.48 54.46 -0.30 -1.19 4818
MOD_00760 o3 18.10 16.50 17.77 84.48 0.47 -0.15 4818
MOD_00760 pm1 6.81 5.12 4.12 118.69 3.36 35.28 4824
MOD_00760 pm10 19.99 16.24 9.95 1536.49 37.65 2043.29 4824
MOD_00760 pm25 7.85 6.32 4.70 120.46 3.10 32.17 4824
Turner Station North co 516.54 485.26 58.43 1434.11 2.59 9.89 10438
Turner Station North no 2.86 2.21 0.51 183.9 15.86 338.86 10438
Turner Station North no2 18.37 20.44 8.69 46.44 -0.17 -1.12 10438
Turner Station North o3 34.61 33.41 9.21 128.17 0.68 1.41 10438
Turner Station North pm1 13.64 9.39 7.46 151.92 2.63 11.16 10429
Turner Station North pm10 25.31 19.46 12.32 2202.2 27.94 1284.99 10429
Turner Station North pm25 14.43 10.20 7.66 153.69 2.61 11.10 10429
Turner Station South co 626.81 603.36 51.99 2145.74 3.02 17.91 12453
Turner Station South no 2.86 2.24 0.58 149.4 16.49 330.46 12393
Turner Station South no2 19.02 21.60 9.89 51.08 -0.19 -1.21 12453
Turner Station South o3 28.42 27.22 9.81 79.2 0.65 0.56 12453
Turner Station South pm1 5.26 4.10 2.96 78.81 2.24 17.42 12513
Turner Station South pm10 22.97 13.72 8.98 5084.11 27.70 947.73 12513
Turner Station South pm25 6.06 4.96 3.39 80.51 2.04 14.60 12513