*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 10577 4 4 10 54 1
MOD_00537 - Turner Station North 10438 4 4 10 281 1
MOD_00733 196 2 2 4 0 2
MOD_00745 - Cedar Heights 9500 4 4 10 108 1
MOD_00746 - HCNR 6191 4 4 6 0 1
MOD_00747 - Turner Station South 12440 4 4 8 56 1
MOD_00748 - Annapolis 10216 3 3 7 14 0
MOD_00749 - HU - Beltsville 5199 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 12238 2 2 5 0 0
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 8728 3 3 7 2 1
Piney_Run 12236 2 2 6 0 0
HCNR 5816 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 Hours_Above_600 Hours_Above_300
B19939 9106 300.88 228.22 4825.180 0.000 1091 3409
C14446 2335 410.37 266.93 3286.814 35.005 438 1041
D11556 10386 512.83 343.93 8837.714 0.000 3038 5695
D11559 11014 315.56 211.05 6972.781 0.000 1668 4124
D14645 11523 730.32 481.98 10031.259 0.000 4780 7794
D14648 11979 586.63 390.91 7959.419 0.000 3850 7474
D14780 1254 141.01 0.00 3047.697 0.000 96 207
D14781 9117 488.58 327.20 8853.832 0.000 2331 4908

Concentration Statistics Matrix
Station Pollutant Mean Median MAD Max (Outlier Check) Skew Kurtosis Valid Obs
Annapolis co 767.31 740.02 57.05 1783.25 2.55 10.55 10263
Annapolis no 2.63 2.18 0.52 191.71 22.70 672.37 10084
Annapolis no2 21.49 25.02 8.59 51.6 -0.43 -1.10 10263
Annapolis o3 22.02 20.87 12.13 67.68 0.46 -0.20 10263
Annapolis pm1 4.71 3.64 2.71 80.17 3.29 38.15 10390
Annapolis pm10 14.07 9.63 5.95 6943.32 65.76 5277.12 10390
Annapolis pm25 5.31 4.31 3.05 81.52 3.04 33.20 10390
Cedar Heights co 797.09 762.44 76.97 2425.91 2.47 11.72 8813
Cedar Heights no 2.60 2.18 0.49 108.92 15.25 287.85 8809
Cedar Heights no2 22.60 25.98 8.12 51.46 -0.45 -0.90 8813
Cedar Heights o3 21.63 19.73 13.40 72.06 0.56 -0.18 8813
Cedar Heights pm1 6.75 5.49 3.83 142.65 6.20 99.37 8883
Cedar Heights pm10 14.96 11.36 6.17 2517.95 34.66 1363.31 8883
Cedar Heights pm25 7.27 6.03 4.02 144.95 6.02 95.31 8883
Cheverly co 498.22 459.32 64.72 1919.86 2.93 13.04 10677
Cheverly no 3.14 2.12 0.44 220.72 12.55 199.23 10646
Cheverly no2 18.23 20.21 8.97 52.11 -0.14 -0.94 10677
Cheverly o3 32.88 32.20 11.57 74.18 0.39 -0.09 10677
Cheverly pm1 8.01 6.56 4.73 114.3 4.47 54.16 10668
Cheverly pm10 18.85 13.76 9.38 4376.43 40.75 1992.35 10668
Cheverly pm25 8.52 7.08 4.90 115.96 4.36 52.36 10668
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 791.23 767.61 81.14 2050.87 1.44 5.88 6192
HCNR no 2.94 2.33 0.62 70.09 9.29 133.06 6192
HCNR no2 26.08 29.68 8.98 48.48 -0.59 -0.87 6192
HCNR o3 23.99 23.81 13.04 58.49 0.21 -0.62 6192
HCNR pm1 5.08 4.00 3.03 25.81 1.24 1.52 6197
HCNR pm10 21.02 10.81 6.62 3868.74 23.73 683.76 6197
HCNR pm25 5.75 4.63 3.36 27.21 1.21 1.43 6197
HU - Beltsville co 738.97 720.68 56.44 1398.29 1.55 4.33 5201
HU - Beltsville no 2.41 2.23 0.51 15.35 3.95 33.98 5201
HU - Beltsville no2 20.09 22.63 8.65 51.75 -0.18 -0.99 5201
HU - Beltsville o3 20.29 18.64 13.06 69.83 0.67 0.18 5201
HU - Beltsville pm1 5.21 4.08 3.05 52.72 1.68 6.34 5204
HU - Beltsville pm10 29.44 9.95 6.37 2912.87 12.19 169.40 5204
HU - Beltsville pm25 5.84 4.70 3.39 54.16 1.52 5.22 5204
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 516.45 485.22 58.33 1434.11 2.59 9.91 10459
Turner Station North no 2.86 2.20 0.51 183.9 15.88 339.52 10459
Turner Station North no2 18.36 20.43 8.70 46.44 -0.17 -1.12 10459
Turner Station North o3 34.61 33.42 9.19 128.17 0.68 1.41 10459
Turner Station North pm1 13.63 9.40 7.47 151.92 2.63 11.19 10450
Turner Station North pm10 25.29 19.44 12.31 2202.2 27.96 1287.15 10450
Turner Station North pm25 14.42 10.20 7.66 153.69 2.61 11.13 10450
Turner Station South co 626.75 603.31 51.90 2145.74 3.02 17.94 12474
Turner Station South no 2.86 2.24 0.58 149.4 16.50 330.99 12414
Turner Station South no2 19.01 21.58 9.90 51.08 -0.19 -1.21 12474
Turner Station South o3 28.42 27.22 9.80 79.2 0.65 0.56 12474
Turner Station South pm1 5.26 4.10 2.96 78.81 2.24 17.43 12534
Turner Station South pm10 22.96 13.71 8.97 5084.11 27.73 949.31 12534
Turner Station South pm25 6.06 4.96 3.39 80.51 2.04 14.61 12534