*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 731 4 4 12 8 2
MOD_00537 - Turner Station North 731 5 5 16 60 2
MOD_00745 - Cedar Heights 731 4 4 11 37 1
MOD_00746 - HCNR 731 3 3 8 7 1
MOD_00747 - Turner Station South 731 4 4 11 23 1
MOD_00748 - Annapolis 731 3 3 10 12 1
MOD_00749 - HU - Beltsville 730 3 3 8 6 1
AQHI Summary at MDE Regulatory Monitors*
Monitor Total_Hours Mean_AQHI Median_AQHI Max_AQHI Hours_High_Risk Min_AQHI
HUB 679 3 3 11 8 1
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 717 3 3 12 10 1
Piney_Run 707 3 2 19 12 0
HCNR 707 3 3 12 8 1
*HCNR statistics are a hybrid of regulatory monitor data (PM2.5 & NO2) and sensor data (O3). 

The highest AQHI value recorded was 16, reached by sensor(s) MOD_00537 - Turner Station North ( 4 h)

Highest AQHI Sensor(s) and Hours at Maximum
Sensor Max_AQHI Hours_at_Max
MOD_00537 - Turner Station North 16 4

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 544 304.63 250.96 1480.970 67.47592 2.435351 9.005862 32 5.9 201 36.9
D11556 731 779.86 580.30 5222.071 91.43944 2.859862 11.505263 350 47.9 621 85.0
D11559 731 492.62 369.78 4587.337 28.07667 4.677611 29.872191 171 23.4 451 61.7
D14645 731 861.55 595.09 6713.082 154.02889 2.924712 12.248398 359 49.1 619 84.7
D14648 731 926.86 572.71 8027.632 102.06278 3.176818 13.380444 351 48.0 608 83.2

Concentration Statistics Matrix
Station Pollutant Mean Median MAD Max (Outlier Check) Skew Kurtosis Valid Obs
Annapolis co 769.72 739.29 70.50 2184.78 5.31 36.83 732
Annapolis no 2.12 1.91 0.45 5.42 1.62 3.53 732
Annapolis no2 15.71 12.61 10.08 39.8 0.54 -0.97 732
Annapolis o3 25.37 22.66 16.85 66.53 0.45 -0.76 732
Annapolis pm1 9.09 7.77 4.84 96.24 5.90 41.58 732
Annapolis pm10 15.54 13.56 6.92 102.24 4.46 27.76 732
Annapolis pm25 9.75 8.22 4.95 97.6 5.78 40.42 732
Cedar Heights co 800.09 768.67 86.86 2229.17 4.25 28.53 732
Cedar Heights no 2.32 1.99 0.51 16.68 5.93 47.73 732
Cedar Heights no2 18.95 16.12 13.68 44.33 0.35 -1.19 732
Cedar Heights o3 25.76 23.14 17.91 72.06 0.46 -0.73 732
Cedar Heights pm1 11.21 9.00 4.72 116.39 6.09 43.46 731
Cedar Heights pm10 17.99 14.37 6.22 131.98 4.91 31.61 731
Cedar Heights pm25 11.89 9.44 4.89 118.05 5.95 42.05 731
Cheverly co 497.72 467.14 63.57 1827.9 5.37 39.89 731
Cheverly no 2.09 1.91 0.32 4.45 1.41 2.05 731
Cheverly no2 14.15 10.81 8.60 61.04 0.87 0.20 731
Cheverly o3 39.83 39.66 15.96 72.62 0.05 -0.77 731
Cheverly pm1 13.67 11.63 6.08 129.13 5.82 40.87 732
Cheverly pm10 25.67 21.65 9.96 213.07 4.39 29.79 732
Cheverly pm25 14.51 12.24 6.44 130.99 5.67 39.40 732
HCNR co 851.14 828.13 102.20 2131.68 4.02 26.70 732
HCNR no 2.53 2.19 0.58 34.79 10.17 147.79 732
HCNR no2 13.73 10.61 6.62 43.69 1.21 0.43 732
HCNR o3 22.37 20.34 19.23 55.92 0.34 -1.13 732
HCNR pm1 9.25 8.05 4.61 105.14 7.04 56.96 732
HCNR pm10 17.95 15.95 6.33 114.3 4.55 28.96 732
HCNR pm25 10.21 8.85 4.87 106.86 6.78 54.11 732
HU - Beltsville co 750.01 727.99 74.71 1920.36 4.89 33.01 733
HU - Beltsville no 2.14 2.03 0.47 7.2 2.01 13.44 733
HU - Beltsville no2 14.08 10.82 7.17 41.24 1.01 0.03 733
HU - Beltsville o3 23.61 19.46 20.62 69.3 0.42 -0.92 733
HU - Beltsville pm1 8.96 7.78 4.87 87.67 5.76 40.77 731
HU - Beltsville pm10 50.08 16.45 7.19 3035.34 8.82 89.28 731
HU - Beltsville pm25 10.01 8.70 5.07 89.91 5.62 39.45 731
Turner Station North co 520.26 488.45 70.00 1848.75 5.20 35.79 732
Turner Station North no 2.16 1.99 0.48 7.56 2.05 10.55 732
Turner Station North no2 14.38 11.25 8.68 46.44 0.69 -0.62 732
Turner Station North o3 42.79 42.32 13.23 80.54 0.33 -0.23 732
Turner Station North pm1 16.08 12.69 7.86 203.63 6.39 45.92 732
Turner Station North pm10 26.87 22.05 9.83 215.54 5.05 32.02 732
Turner Station North pm25 17.32 13.69 8.30 206.59 6.26 44.68 732
Turner Station South co 643.52 608.46 67.00 2449.21 5.88 44.57 731
Turner Station South no 2.23 1.97 0.54 10.98 3.00 18.93 731
Turner Station South no2 14.48 11.47 9.07 42.46 0.73 -0.69 731
Turner Station South o3 33.26 30.84 14.67 71.3 0.50 -0.48 731
Turner Station South pm1 9.90 8.19 5.38 112.61 5.70 38.67 732
Turner Station South pm10 27.09 22.16 12.06 142.88 2.43 7.90 732
Turner Station South pm25 10.85 8.84 5.59 116.16 5.56 37.48 732