*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 614 4 4 6 0 2
MOD_00537 - Turner Station North 731 4 4 8 25 2
MOD_00745 - Cedar Heights 731 4 4 7 31 1
MOD_00746 - HCNR 731 3 2 5 0 1
MOD_00747 - Turner Station South 731 3 3 7 9 1
MOD_00748 - Annapolis 731 3 3 7 4 1
MOD_00749 - HU - Beltsville 731 3 2 6 0 1
AQHI Summary at MDE Regulatory Monitors*
Monitor Total_Hours Mean_AQHI Median_AQHI Max_AQHI Hours_High_Risk Min_AQHI
HUB 705 2 3 5 0 1
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 724 3 3 5 0 1
Piney_Run 700 2 2 4 0 0
HCNR 716 4 4 6 0 1
*HCNR statistics are a hybrid of regulatory monitor data (PM2.5 & NO2) and sensor data (O3). All regulatory data is preliminary 

The highest AQHI value recorded was 8, 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 8 4

Summary Statistics for MetOne Sensors (880nm)
Monitor Total Hours Mean 880 Median 880 Max 880 Min 880 Skew Kurtosis #Hours ≥600 %Hours ≥600 #Hours ≥330 %Hours ≥330 #Hours ≥33 %Hours ≥33
B19939 484 138.50 100.74 734.685 38.15439 2.450077 8.317244 4 0.8 19 3.9 484 100
D11556 734 667.02 560.04 3629.185 104.37000 1.880829 5.810171 342 46.6 527 71.8 734 100
D11559 734 430.47 346.06 4872.530 71.89500 4.529515 45.559316 153 20.8 390 53.1 734 100
D14645 715 911.71 570.77 11722.635 97.15167 3.969267 26.188493 351 49.1 529 74.0 715 100
D14648 666 709.34 519.20 4511.680 58.52167 1.981924 4.891735 289 43.4 471 70.7 666 100

Ratio Polar Plots by Location

Cheverly

PM1 / PM2.5

PM2.5 / PM10

BC / PM2.5

NO2 / NO

Turner Station North

PM1 / PM2.5

PM2.5 / PM10

BC / PM2.5

NO2 / NO

Cedar Heights

PM1 / PM2.5

PM2.5 / PM10

BC / PM2.5

NO2 / NO

HCNR

PM1 / PM2.5

PM2.5 / PM10

NO2 / NO

Turner Station South

PM1 / PM2.5

PM2.5 / PM10

BC / PM2.5

NO2 / NO

Annapolis

PM1 / PM2.5

PM2.5 / PM10

BC / PM2.5

NO2 / NO

HU - Beltsville

PM1 / PM2.5

PM2.5 / PM10

NO2 / NO

Concentration Statistics Matrix; red highlighting =/>6x MAD; fog filter applied to PM2.5 & PM10 data
Station Pollutant Mean Median MAD Max (Outlier Check) Skew Kurtosis Valid Obs
Annapolis co 780.96 758.29 75.63 1304.39 1.46 3.24 731
Annapolis no 2.06 1.86 0.38 4.97 1.68 3.76 731
Annapolis no2 14.82 11.69 9.18 42.26 0.69 -0.81 731
Annapolis o3 23.03 21.53 14.93 52.26 0.30 -0.95 731
Annapolis pm1 6.27 5.31 3.42 17.03 0.86 0.02 735
Annapolis pm10 11.33 11.05 4.18 33.97 0.68 1.02 735
Annapolis pm25 6.76 5.84 3.35 17.38 0.83 -0.01 735
Cedar Heights co 816.03 794.47 97.68 1940.84 1.93 9.31 731
Cedar Heights no 2.14 1.90 0.41 9.42 3.10 22.45 731
Cedar Heights no2 18.65 15.83 13.01 51.04 0.41 -1.11 731
Cedar Heights o3 23.03 20.35 15.42 55.2 0.41 -0.90 731
Cedar Heights pm1 8.38 7.44 5.10 55.43 2.33 16.29 735
Cedar Heights pm10 12.93 12.00 5.06 58.83 2.19 11.68 735
Cedar Heights pm25 8.79 7.95 5.20 56.03 2.37 16.81 735
Cheverly co 519.85 495.18 76.27 1014.55 1.72 3.93 617
Cheverly no 2.06 1.89 0.29 4.3 1.42 2.78 617
Cheverly no2 14.18 11.79 8.66 42.46 0.55 -0.86 617
Cheverly o3 38.38 37.45 14.26 74.32 0.18 -0.79 617
Cheverly pm1 10.24 9.49 5.98 34.33 0.76 0.39 626
Cheverly pm10 19.16 18.28 7.89 94.61 2.34 12.81 626
Cheverly pm25 10.76 10.01 5.83 34.86 0.75 0.38 626
HCNR co 868.38 843.84 107.15 1527.95 1.06 1.77 732
HCNR no 2.26 2.06 0.50 11.16 4.29 32.76 732
HCNR no2 12.82 9.97 6.52 47.28 1.21 0.70 732
HCNR o3 20.42 16.97 16.35 51.25 0.42 -1.09 732
HCNR pm1 6.77 5.63 3.64 19.02 0.89 0.06 735
HCNR pm10 14.38 13.99 5.43 49.19 1.28 4.28 735
HCNR pm25 7.44 6.31 3.64 19.45 0.87 0.01 735
HU - Beltsville co 758.59 748.93 68.81 1239.11 1.58 4.95 731
HU - Beltsville no 2.07 1.92 0.34 3.56 0.76 -0.37 731
HU - Beltsville no2 13.55 10.72 6.95 43.51 1.11 0.31 731
HU - Beltsville o3 20.69 16.57 19.49 58.12 0.45 -1.04 731
HU - Beltsville pm1 6.66 5.67 3.73 22.59 1.04 0.87 735
HU - Beltsville pm10 19.64 15.43 7.38 182.4 3.91 18.95 734
HU - Beltsville pm25 7.43 6.51 3.66 22.96 1.00 0.81 734
Turner Station North co 532.62 510.87 72.30 1016.19 1.46 3.12 732
Turner Station North no 2.03 1.87 0.39 3.88 0.96 0.50 732
Turner Station North no2 13.20 10.85 7.48 47.66 0.95 0.15 732
Turner Station North o3 39.64 39.94 11.94 66.31 0.07 -0.83 732
Turner Station North pm1 11.04 9.57 6.22 28.89 0.75 -0.33 735
Turner Station North pm10 19.51 18.47 7.66 49.3 0.73 0.36 735
Turner Station North pm25 11.83 10.34 6.16 29.33 0.74 -0.37 735
Turner Station South co 650.19 631.18 68.58 1415.16 2.24 8.88 732
Turner Station South no 2.13 1.88 0.43 5.6 1.75 3.97 732
Turner Station South no2 13.74 10.82 8.21 47.39 0.88 -0.26 732
Turner Station South o3 30.34 28.79 12.89 55.88 0.26 -0.96 732
Turner Station South pm1 6.88 5.73 3.87 19.88 0.93 0.28 735
Turner Station South pm10 24.47 20.50 8.18 205.31 3.83 23.48 735
Turner Station South pm25 7.58 6.32 3.94 21.19 0.91 0.25 735