*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 732 4 4 12 29 2
MOD_00537 - Turner Station North 732 5 5 16 100 2
MOD_00745 - Cedar Heights 732 4 4 11 64 1
MOD_00746 - HCNR 732 3 3 8 19 1
MOD_00747 - Turner Station South 732 4 4 11 45 1
MOD_00748 - Annapolis 732 3 3 10 30 1
MOD_00749 - HU - Beltsville 730 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 688 3 2 11 23 1
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 717 3 3 12 30 1
Piney_Run 707 3 2 19 36 0
HCNR 707 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 472 312.62 251.97 1482.943 67.47592 2.303957 7.843196 32 6.8 186 39.4
D11556 731 873.13 635.00 5222.071 91.43944 2.379001 7.197051 388 53.1 625 85.5
D11559 731 569.39 406.16 4587.337 28.07667 3.579198 16.579807 204 27.9 487 66.6
D14645 731 972.69 658.89 6923.434 154.02889 2.737486 10.702532 401 54.9 640 87.6
D14648 731 1018.03 630.91 8027.632 102.06278 2.873948 10.893448 391 53.5 632 86.5

Concentration Statistics Matrix
Station Pollutant Mean Median MAD Max (Outlier Check) Skew Kurtosis Valid Obs
Annapolis co 808.85 751.79 78.77 2184.78 3.33 14.63 733
Annapolis no 2.10 1.89 0.46 5.83 1.80 4.92 733
Annapolis no2 15.11 12.35 9.54 39.8 0.63 -0.85 733
Annapolis o3 24.96 21.68 17.13 66.53 0.50 -0.77 733
Annapolis pm1 11.09 8.17 4.97 96.24 3.83 16.77 733
Annapolis pm10 17.53 14.14 6.90 102.24 3.23 12.93 733
Annapolis pm25 11.79 8.68 5.31 97.6 3.79 16.56 733
Cedar Heights co 840.63 787.92 100.06 2228.42 2.95 12.84 733
Cedar Heights no 2.30 1.95 0.50 16.68 5.89 46.80 733
Cedar Heights no2 18.42 15.61 12.90 44.33 0.44 -1.08 733
Cedar Heights o3 25.27 21.78 17.79 72.06 0.54 -0.69 733
Cedar Heights pm1 13.98 9.62 5.40 118.82 3.93 17.68 732
Cedar Heights pm10 20.33 14.85 6.63 135.55 3.60 15.79 732
Cedar Heights pm25 14.68 10.10 5.78 120.62 3.89 17.50 732
Cheverly co 540.10 485.00 78.18 1824.84 3.27 14.26 732
Cheverly no 2.06 1.88 0.30 4.35 1.30 1.43 732
Cheverly no2 13.83 10.75 8.32 61.04 1.01 0.70 732
Cheverly o3 39.35 38.67 15.89 77.58 0.20 -0.69 732
Cheverly pm1 16.66 12.26 6.43 129.13 3.78 16.41 733
Cheverly pm10 28.02 23.11 10.66 137.28 2.81 10.07 733
Cheverly pm25 17.51 12.82 6.83 130.99 3.74 16.20 733
HCNR co 897.90 844.85 113.51 2130.06 2.68 9.64 733
HCNR no 2.45 2.12 0.55 34.79 11.25 187.93 733
HCNR no2 13.02 10.27 6.31 42.01 1.29 0.68 733
HCNR o3 21.81 18.71 18.41 55.92 0.39 -1.13 733
HCNR pm1 12.06 8.64 4.67 114.93 4.21 19.19 733
HCNR pm10 20.92 17.18 6.54 123.39 3.45 14.24 733
HCNR pm25 13.07 9.59 5.01 117.01 4.16 18.97 733
HU - Beltsville co 791.79 741.57 81.13 1920.36 2.97 10.93 733
HU - Beltsville no 2.14 2.00 0.45 7.2 2.00 12.90 733
HU - Beltsville no2 13.40 10.69 6.75 41.24 1.15 0.36 733
HU - Beltsville o3 22.96 18.23 20.80 69.3 0.49 -0.89 733
HU - Beltsville pm1 11.22 8.30 4.97 89.34 3.80 15.50 731
HU - Beltsville pm10 55.96 17.42 7.86 3035.34 8.41 82.52 731
HU - Beltsville pm25 12.34 9.03 5.07 91.24 3.77 15.45 731
Turner Station North co 564.59 505.44 81.41 1848.75 3.16 12.38 733
Turner Station North no 2.13 1.96 0.47 7.56 2.04 11.63 733
Turner Station North no2 14.01 10.96 8.22 46.44 0.79 -0.44 733
Turner Station North o3 42.41 41.68 13.62 80.54 0.37 -0.32 733
Turner Station North pm1 20.60 13.87 8.50 203.63 4.20 19.47 733
Turner Station North pm10 31.43 22.81 10.41 215.54 3.63 15.22 733
Turner Station North pm25 21.88 14.92 9.09 206.59 4.16 19.24 733
Turner Station South co 691.82 625.23 78.98 2434.65 3.53 15.73 732
Turner Station South no 2.20 1.93 0.53 10.98 3.09 20.44 732
Turner Station South no2 14.21 11.05 8.72 45.46 0.79 -0.54 732
Turner Station South o3 32.86 30.04 14.81 71.3 0.53 -0.50 732
Turner Station South pm1 12.48 8.74 5.37 112.61 3.71 14.97 733
Turner Station South pm10 30.01 23.02 12.25 193.66 2.39 7.19 733
Turner Station South pm25 13.51 9.30 5.69 116.16 3.67 14.83 733