*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 621 4 4 12 29 2
MOD_00537 - Turner Station North 738 5 4 16 87 2
MOD_00745 - Cedar Heights 738 4 4 11 59 1
MOD_00746 - HCNR 738 3 3 8 19 1
MOD_00747 - Turner Station South 738 4 4 11 41 1
MOD_00748 - Annapolis 738 3 3 10 27 1
MOD_00749 - HU - Beltsville 736 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 680 3 2 11 23 1
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 721 3 3 12 30 1
Piney_Run 714 3 2 19 36 1
HCNR 725 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 Hours ≥ 30 % Time ≥ 30
B19939 390 184.86 160.67 755.7062 44.34668 1.843163 4.477697 8 2.1 41 10.5 390 100
D11556 737 781.88 537.83 5222.0711 91.43944 2.658349 9.003654 342 46.4 568 77.1 737 100
D11559 737 514.01 335.67 4587.3372 78.45556 3.876270 18.668541 159 21.6 427 57.9 737 100
D14645 737 948.95 626.39 6923.4344 100.30833 2.683119 10.122031 384 52.1 615 83.4 737 100
D14648 737 912.00 556.29 8027.6322 87.01889 3.152120 13.215495 340 46.1 571 77.5 737 100

Concentration Statistics Matrix
Station Pollutant Mean Median MAD Max (Outlier Check) Skew Kurtosis Valid Obs
Annapolis co 814.17 750.96 80.32 2184.78 3.19 13.54 739
Annapolis no 2.10 1.90 0.42 5.83 2.01 6.05 739
Annapolis no2 15.86 12.90 10.52 39.36 0.49 -1.09 739
Annapolis o3 25.06 23.14 15.66 66.53 0.40 -0.61 739
Annapolis pm1 10.03 6.25 4.20 96.24 3.79 16.35 739
Annapolis pm10 15.72 12.77 6.45 102.24 3.45 14.10 739
Annapolis pm25 10.57 6.81 4.25 97.6 3.80 16.42 739
Cedar Heights co 841.13 787.32 99.74 2228.42 2.99 12.77 739
Cedar Heights no 2.25 1.94 0.47 16.68 6.79 65.28 739
Cedar Heights no2 18.88 16.59 14.40 49.26 0.32 -1.22 739
Cedar Heights o3 24.54 21.57 16.04 72.06 0.58 -0.36 739
Cedar Heights pm1 13.07 8.34 5.19 118.82 3.88 17.23 738
Cedar Heights pm10 18.26 13.35 6.09 135.55 3.85 17.41 738
Cedar Heights pm25 13.56 8.70 5.24 120.62 3.88 17.33 738
Cheverly co 553.13 488.09 82.06 1824.84 3.16 12.67 623
Cheverly no 2.08 1.90 0.33 4.35 1.41 2.37 623
Cheverly no2 14.26 11.37 9.05 61.04 0.81 0.52 623
Cheverly o3 40.00 39.13 14.20 77.58 0.26 -0.55 623
Cheverly pm1 16.45 10.50 5.83 129.13 3.49 13.60 630
Cheverly pm10 25.92 20.30 10.02 137.28 2.96 10.36 630
Cheverly pm25 17.06 11.33 5.87 130.99 3.50 13.65 630
HCNR co 907.60 851.97 116.31 2130.06 2.63 9.16 739
HCNR no 2.29 2.08 0.52 11.46 4.74 39.45 739
HCNR no2 12.98 10.01 6.44 46.36 1.25 0.66 739
HCNR o3 21.74 19.05 17.29 55.92 0.36 -1.05 739
HCNR pm1 11.14 7.19 4.59 114.93 4.17 18.81 739
HCNR pm10 18.86 15.48 6.52 123.39 3.80 16.52 739
HCNR pm25 11.86 8.03 4.88 117.01 4.19 19.00 739
HU - Beltsville co 791.78 738.28 70.14 1920.36 3.04 11.07 738
HU - Beltsville no 2.11 1.98 0.42 3.88 0.78 0.09 738
HU - Beltsville no2 13.76 10.76 6.97 43.51 1.05 0.06 738
HU - Beltsville o3 22.85 19.58 20.16 69.3 0.43 -0.82 738
HU - Beltsville pm1 10.45 6.71 4.71 89.34 3.73 15.02 737
HU - Beltsville pm10 23.42 16.13 8.51 309.25 4.36 31.07 736
HU - Beltsville pm25 11.23 7.40 4.81 91.24 3.77 15.27 736
Turner Station North co 566.69 504.00 73.98 1848.75 3.15 12.15 739
Turner Station North no 2.10 1.94 0.45 3.88 0.89 0.34 739
Turner Station North no2 14.09 11.20 8.56 46.44 0.74 -0.55 739
Turner Station North o3 41.74 41.25 11.84 79.87 0.36 -0.15 739
Turner Station North pm1 18.84 10.63 7.29 203.63 4.18 19.19 739
Turner Station North pm10 27.85 19.61 9.84 215.54 3.95 17.39 739
Turner Station North pm25 19.73 11.53 7.53 206.59 4.18 19.23 739
Turner Station South co 692.28 624.81 73.21 2434.65 3.46 14.93 739
Turner Station South no 2.19 1.94 0.51 6.41 1.85 4.87 739
Turner Station South no2 14.60 11.54 9.84 45.46 0.67 -0.77 739
Turner Station South o3 32.35 30.43 13.42 71.3 0.47 -0.46 739
Turner Station South pm1 11.44 6.55 4.88 112.61 3.67 14.64 739
Turner Station South pm10 29.39 21.89 10.60 205.31 2.72 9.55 739
Turner Station South pm25 12.25 7.22 5.08 116.16 3.69 14.83 739