*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):

Environment and Climate Change Canada’s Air Quality Health Index (AQHI) is a reliable guide to daily health risks, made stronger by the addition of black carbon data. While the AQHI+ successfully captures common and immediate threats to human health, no single index is exhaustive for all toxic substances or localized pollutants. Due to compounding health disparities and socio-environmental stressors, the reported AQHI+ represents a conservative baseline; the actual risk to residents in the tracts mentioned above is likely higher than this 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 692 4 4 12 29 2
MOD_00537 - Turner Station North 720 5 5 16 104 2
MOD_00745 - Cedar Heights 720 4 4 11 66 1
MOD_00746 - HCNR 720 3 3 8 19 1
MOD_00747 - Turner Station South 720 4 4 11 48 1
MOD_00748 - Annapolis 720 3 3 10 30 1
MOD_00749 - HU - Beltsville 718 3 3 10 16 0
AQHI Summary at MDE Regulatory Monitors*
Monitor Total_Hours Mean_AQHI Median_AQHI Max_AQHI Hours_High_Risk Min_AQHI
HUB 696 3 3 11 23 1
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 729 3 3 12 30 1
Piney_Run 715 3 2 19 36 0
HCNR 700 3 3 12 30 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 448 320.94 257.12 1482.943 72.57722 2.284172 7.654949 32 7.1 184 41.1
D11556 743 876.53 633.66 5222.071 91.43944 2.353424 7.070666 390 52.5 637 85.7
D11559 743 569.76 408.13 4587.337 28.07667 3.622747 16.986823 206 27.7 504 67.8
D14645 743 961.54 656.11 6923.434 154.02889 2.790914 11.040917 407 54.8 654 88.0
D14648 743 1044.85 658.46 8027.632 102.06278 2.829126 10.738773 419 56.4 656 88.3

Concentration Statistics Matrix
Station Pollutant Mean Median MAD Max (Outlier Check) Skew Kurtosis Valid Obs
Annapolis co 816.60 753.66 80.76 2184.78 3.20 13.53 721
Annapolis no 2.07 1.85 0.43 5.83 1.95 5.60 721
Annapolis no2 14.51 11.45 8.72 39.8 0.71 -0.72 721
Annapolis o3 24.61 21.45 16.96 66.53 0.51 -0.70 721
Annapolis pm1 11.53 8.36 4.63 96.24 3.82 16.65 721
Annapolis pm10 18.14 14.57 6.45 102.24 3.30 13.32 721
Annapolis pm25 12.25 9.00 4.90 97.6 3.79 16.54 721
Cedar Heights co 848.77 790.00 103.51 2228.42 2.82 11.79 721
Cedar Heights no 2.26 1.90 0.45 16.68 6.00 47.62 721
Cedar Heights no2 17.91 14.92 12.23 44.33 0.52 -1.00 721
Cedar Heights o3 24.78 21.03 17.21 72.06 0.58 -0.58 721
Cedar Heights pm1 14.49 10.00 5.20 118.82 3.92 17.55 720
Cedar Heights pm10 20.71 15.50 6.95 135.55 3.67 16.25 720
Cedar Heights pm25 15.19 10.46 5.52 120.62 3.88 17.41 720
Cheverly co 547.90 488.21 79.70 1824.84 3.25 13.89 692
Cheverly no 2.04 1.86 0.26 4.35 1.29 1.26 692
Cheverly no2 13.64 10.56 8.19 61.04 1.03 0.90 692
Cheverly o3 38.92 38.15 15.94 77.58 0.25 -0.65 692
Cheverly pm1 17.44 12.73 6.14 129.13 3.72 15.72 693
Cheverly pm10 29.07 23.95 10.57 137.28 2.82 9.93 693
Cheverly pm25 18.33 13.23 6.61 130.99 3.68 15.58 693
HCNR co 914.94 856.74 112.03 2130.06 2.55 8.74 721
HCNR no 2.45 2.08 0.53 34.79 11.07 182.81 721
HCNR no2 12.48 9.78 5.83 42.01 1.41 1.15 721
HCNR o3 21.21 18.09 17.55 55.92 0.43 -1.05 721
HCNR pm1 12.58 9.11 4.12 114.93 4.20 19.06 721
HCNR pm10 21.79 17.77 6.12 123.39 3.56 14.80 721
HCNR pm25 13.62 9.90 4.54 117.01 4.17 18.96 721
HU - Beltsville co 803.03 745.61 80.35 1920.36 2.83 9.89 721
HU - Beltsville no 2.12 1.95 0.42 7.2 2.03 12.73 721
HU - Beltsville no2 12.81 10.39 6.13 41.24 1.27 0.70 721
HU - Beltsville o3 22.68 18.23 20.76 69.3 0.51 -0.82 721
HU - Beltsville pm1 11.69 8.60 4.84 89.34 3.76 15.23 719
HU - Beltsville pm10 57.27 18.03 7.13 3035.34 8.34 81.20 719
HU - Beltsville pm25 12.84 9.52 4.70 91.24 3.76 15.32 719
Turner Station North co 575.28 510.76 85.83 1848.75 3.00 11.28 721
Turner Station North no 2.10 1.92 0.44 7.56 2.21 13.04 721
Turner Station North no2 13.71 10.62 7.84 46.44 0.86 -0.28 721
Turner Station North o3 42.21 41.63 13.54 80.54 0.38 -0.25 721
Turner Station North pm1 21.33 14.65 8.06 203.63 4.18 19.25 721
Turner Station North pm10 32.46 23.90 9.93 215.54 3.65 15.36 721
Turner Station North pm25 22.65 15.60 8.44 206.59 4.15 19.09 721
Turner Station South co 704.37 631.61 84.86 2434.65 3.35 14.32 720
Turner Station South no 2.17 1.86 0.47 10.98 3.16 20.50 720
Turner Station South no2 13.72 10.42 7.96 45.46 0.88 -0.33 720
Turner Station South o3 32.52 29.98 14.29 71.3 0.56 -0.40 720
Turner Station South pm1 13.03 9.03 4.88 112.61 3.69 14.81 721
Turner Station South pm10 31.58 24.30 11.98 193.66 2.36 6.99 721
Turner Station South pm25 14.10 9.75 5.25 116.16 3.67 14.77 721