*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 618 4 4 12 29 2
MOD_00537 - Turner Station North 735 5 4 16 83 2
MOD_00745 - Cedar Heights 735 4 4 11 56 1
MOD_00746 - HCNR 735 3 3 8 19 1
MOD_00747 - Turner Station South 735 4 4 11 41 1
MOD_00748 - Annapolis 735 3 3 10 27 1
MOD_00749 - HU - Beltsville 735 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 687 3 3 12 33 1
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 718 3 3 12 30 1
Piney_Run 690 3 2 19 36 0
HCNR 722 4 4 13 37 2
*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 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 %Hours ≥600 #Hours ≥300 %Hours ≥300 #Hours ≥30 %Hours ≥30
B19939 386 162.25 134.08 663.0478 44.34668 1.805579 4.938364 4 1.0 26 6.7 386 100
D11556 734 767.95 512.08 5222.0711 91.43944 2.650138 8.890477 327 44.6 547 74.5 734 100
D11559 734 499.54 325.71 4587.3372 78.45556 3.920349 18.883182 146 19.9 404 55.0 734 100
D14645 734 944.73 617.65 6923.4344 100.30833 2.674847 10.026264 377 51.4 608 82.8 734 100
D14648 734 861.04 529.54 8027.6322 87.01889 3.124518 13.639005 318 43.3 555 75.6 734 100

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 809.66 748.27 76.58 2184.78 3.34 14.57 736
Annapolis no 2.08 1.89 0.40 5.83 2.01 6.46 736
Annapolis no2 15.90 13.21 11.13 39.36 0.48 -1.10 736
Annapolis o3 24.50 22.79 14.94 66.53 0.36 -0.63 736
Annapolis pm1 9.40 5.54 3.62 96.24 3.88 16.76 736
Annapolis pm10 15.16 11.95 5.86 102.24 3.52 14.37 736
Annapolis pm25 9.93 6.09 3.71 97.6 3.89 16.90 736
Cedar Heights co 836.11 782.89 93.72 2228.42 3.20 14.10 736
Cedar Heights no 2.15 1.92 0.44 7.17 2.38 10.87 736
Cedar Heights no2 19.00 16.43 14.20 49.26 0.31 -1.25 736
Cedar Heights o3 23.95 21.04 15.21 69.32 0.52 -0.50 736
Cedar Heights pm1 11.84 7.34 4.62 118.82 4.30 20.98 736
Cedar Heights pm10 17.03 12.77 5.77 135.55 4.25 20.88 736
Cedar Heights pm25 12.29 7.86 4.74 120.62 4.32 21.19 736
Cheverly co 548.00 481.53 73.85 1824.84 3.24 13.13 621
Cheverly no 2.06 1.88 0.30 4.35 1.46 2.57 621
Cheverly no2 14.66 11.98 9.19 61.04 0.75 0.43 621
Cheverly o3 39.33 38.63 13.78 77.58 0.29 -0.42 621
Cheverly pm1 14.81 9.49 5.48 129.13 3.87 16.59 627
Cheverly pm10 24.38 19.01 9.64 137.28 3.18 11.96 627
Cheverly pm25 15.38 10.18 5.67 130.99 3.88 16.72 627
HCNR co 909.08 851.61 112.89 2130.06 2.69 9.38 736
HCNR no 2.29 2.09 0.51 11.46 4.84 40.81 736
HCNR no2 13.31 10.59 7.23 46.36 1.16 0.46 736
HCNR o3 21.31 18.68 16.48 50.92 0.36 -1.09 736
HCNR pm1 10.68 6.32 4.18 114.93 4.18 18.77 736
HCNR pm10 18.38 14.90 6.16 123.39 3.86 16.95 736
HCNR pm25 11.38 7.30 4.33 117.01 4.20 19.00 736
HU - Beltsville co 790.21 736.30 69.83 1920.36 3.14 11.53 735
HU - Beltsville no 2.10 1.97 0.39 3.88 0.79 0.10 735
HU - Beltsville no2 13.96 10.80 7.17 43.51 1.01 -0.02 735
HU - Beltsville o3 22.31 18.85 19.21 67.2 0.40 -0.89 735
HU - Beltsville pm1 9.81 5.92 4.03 89.34 3.84 15.73 736
HU - Beltsville pm10 22.90 15.56 8.53 309.25 4.34 30.72 735
HU - Beltsville pm25 10.58 6.81 4.10 91.24 3.88 16.02 735
Turner Station North co 563.36 501.07 70.70 1848.75 3.20 12.40 736
Turner Station North no 2.08 1.92 0.43 3.88 0.96 0.52 736
Turner Station North no2 14.14 11.34 8.78 40.51 0.66 -0.78 736
Turner Station North o3 41.07 40.81 11.18 69.12 0.19 -0.60 736
Turner Station North pm1 17.77 9.56 6.60 203.63 4.24 19.57 736
Turner Station North pm10 26.58 18.46 8.84 215.54 4.05 17.96 736
Turner Station North pm25 18.62 10.41 6.78 206.59 4.25 19.65 736
Turner Station South co 688.21 621.17 70.74 2434.65 3.49 15.04 736
Turner Station South no 2.17 1.91 0.47 6.41 1.79 4.80 736
Turner Station South no2 14.71 11.75 9.94 45.46 0.63 -0.84 736
Turner Station South o3 31.73 30.06 12.79 59.52 0.31 -0.92 736
Turner Station South pm1 10.79 5.74 4.12 112.61 3.72 14.88 736
Turner Station South pm10 28.88 21.18 10.78 205.31 2.70 9.35 736
Turner Station South pm25 11.57 6.38 4.17 116.16 3.76 15.13 736