AQSQID: 250250042

Site Name: Boston - Roxbury

Location: Roxbury (Roxbury), MA

Reporting: True, Located: True

Current AQI: 38.0

Roxbury (Roxbury) MA, US: 42.329399, -71.082497

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 30, 2020, 2 p.m. 13.0 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 36.0 ppb (28) 0.17 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 30, 2020, 1 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 36.0 ppb (28) 0.18 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 30, 2020, noon 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 35.0 ppb (27) 0.17 ppb (2) N/A N/A 27.0
 
March 30, 2020, 11 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 35.0 ppb (27) 0.18 ppb (2) N/A 3.0 μg/m3 (12) 27.0
 
March 30, 2020, 10 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 35.0 ppb (27) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 27.0
 
March 30, 2020, 9 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 36.0 ppb (28) 0.15 ppb (2) N/A -2.0 μg/m3 (0) 28.0
 
March 30, 2020, 8 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 36.0 ppb (28) 0.14 ppb (2) N/A 0.0 μg/m3 (0) 28.0
 
March 30, 2020, 7 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 36.0 ppb (28) 0.15 ppb (2) N/A 1.0 μg/m3 (4) 28.0
 
March 30, 2020, 6 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 37.0 ppb (28) 0.14 ppb (2) N/A 3.0 μg/m3 (12) 28.0
 
March 30, 2020, 5 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 38.0 ppb (29) 0.13 ppb (1) N/A 3.0 μg/m3 (12) 29.0
 
March 30, 2020, 4 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) 0.14 ppb (2) N/A -1.0 μg/m3 (0) 29.0
 
March 30, 2020, 3 a.m. 7.0 ppb (6) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (28) 0.15 ppb (2) N/A 1.0 μg/m3 (4) 28.0
 
March 30, 2020, 2 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) 0.15 ppb (2) N/A 2.0 μg/m3 (8) 29.0
 
March 30, 2020, 1 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 38.0 ppb (29) 0.15 ppb (2) N/A 1.0 μg/m3 (4) 29.0
 
March 30, 2020, midnight 6.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 38.0 ppb (29) 0.14 ppb (2) N/A 2.0 μg/m3 (8) 29.0
 
March 29, 2020, 11 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 39.0 ppb (30) 0.14 ppb (2) N/A 1.0 μg/m3 (4) 30.0
 
March 29, 2020, 10 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 39.0 ppb (30) 0.14 ppb (2) N/A 0.0 μg/m3 (0) 30.0
 
March 29, 2020, 9 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 39.0 ppb (30) 0.14 ppb (2) N/A 2.0 μg/m3 (8) 30.0
 
March 29, 2020, 8 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 41.0 ppb (32) 0.14 ppb (2) N/A 1.0 μg/m3 (4) 32.0
 
March 29, 2020, 7 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 40.0 ppb (31) 0.15 ppb (2) N/A -4.0 μg/m3 (0) 31.0
 
March 29, 2020, 6 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) 0.15 ppb (2) N/A -4.0 μg/m3 (0) 29.0
 
March 29, 2020, 5 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 39.0 ppb (30) 0.15 ppb (2) N/A 0.0 μg/m3 (0) 30.0
 
March 29, 2020, 4 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 40.0 ppb (31) 0.16 ppb (2) N/A 1.0 μg/m3 (4) 31.0
 
March 29, 2020, 3 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) 0.14 ppb (2) N/A 1.0 μg/m3 (4) 32.0
 
March 29, 2020, 2 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 37.0 ppb (28) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 28.0
 
March 29, 2020, 1 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) 0.15 ppb (2) N/A 4.0 μg/m3 (17) 29.0
 
March 29, 2020, noon 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 36.0 ppb (28) 0.15 ppb (2) N/A 4.0 μg/m3 (17) 28.0
 
March 29, 2020, 11 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 34.0 ppb (26) N/A N/A 1.0 μg/m3 (4) 26.0
 
March 29, 2020, 10 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 33.0 ppb (25) N/A N/A 3.0 μg/m3 (12) 25.0
 
March 29, 2020, 9 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 29, 2020, 8 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.14 ppb (2) N/A 2.0 μg/m3 (8) 8.0
 
March 29, 2020, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 32.0 ppb (25) 0.15 ppb (2) N/A 2.0 μg/m3 (8) 25.0
 
March 29, 2020, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 30.0 ppb (23) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 23.0
 
March 29, 2020, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 26.0 ppb (20) 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 29, 2020, 4 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A 28.0 ppb (22) 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 29, 2020, 3 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 30.0 ppb (23) 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 29, 2020, 2 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A N/A 27.0 ppb (21) 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 29, 2020, 1 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (22) 0.23 ppb (3) N/A 14.0 μg/m3 (54) 54.0
 
March 29, 2020, midnight 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 31.0 ppb (24) 0.27 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, 11 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 34.0 ppb (26) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 26.0
 
March 28, 2020, 10 p.m. 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 28.0 ppb (22) 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 28, 2020, 9 p.m. 21.0 ppb (19) 3.0 ppb (3) N/A 17.0 ppb (16) N/A 1.0 ppb (1) 25.0 ppb (19) 0.26 ppb (3) N/A 8.0 μg/m3 (33) 33.0
 
March 28, 2020, 8 p.m. 13.0 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 30.0 ppb (23) 0.21 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
March 28, 2020, 7 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 35.0 ppb (27) 0.17 ppb (2) N/A 6.0 μg/m3 (25) 27.0
 
March 28, 2020, 6 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 36.0 ppb (28) 0.16 ppb (2) N/A 5.0 μg/m3 (21) 28.0
 
March 28, 2020, 5 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 36.0 ppb (28) 0.18 ppb (2) N/A 5.0 μg/m3 (21) 28.0
 
March 28, 2020, 4 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 35.0 ppb (27) 0.19 ppb (2) N/A 2.0 μg/m3 (8) 27.0
 
March 28, 2020, 3 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 36.0 ppb (28) 0.18 ppb (2) N/A 0.0 μg/m3 (0) 28.0
 
March 28, 2020, 2 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 36.0 ppb (28) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 28.0
 
March 28, 2020, 1 p.m. 22.0 ppb (20) 7.0 ppb (6) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 27.0 ppb (21) 0.2 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 28, 2020, noon 41.0 ppb (38) 15.0 ppb (14) N/A 25.0 ppb (23) N/A 1.0 ppb (1) 15.0 ppb (12) 0.26 ppb (3) N/A 7.0 μg/m3 (29) 38.0
 
March 28, 2020, 11 a.m. 42.0 ppb (39) 13.0 ppb (12) N/A 29.0 ppb (27) N/A 1.0 ppb (1) 10.0 ppb (8) 0.4 ppb (4) N/A 4.0 μg/m3 (17) 39.0
 
March 28, 2020, 10 a.m. 39.0 ppb (36) 7.0 ppb (6) N/A 32.0 ppb (30) N/A 1.0 ppb (1) 6.0 ppb (5) 0.37 ppb (4) N/A 4.0 μg/m3 (17) 36.0
 
March 28, 2020, 9 a.m. 19.0 ppb (18) 2.0 ppb (2) N/A 17.0 ppb (16) N/A 0.0 ppb (0) 20.0 ppb (15) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 18.0
 
March 28, 2020, 8 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 29.0 ppb (22) 0.16 ppb (2) N/A 4.0 μg/m3 (17) 22.0
 
March 28, 2020, 7 a.m. 19.0 ppb (18) 5.0 ppb (5) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 25.0 ppb (19) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 19.0
 
March 28, 2020, 6 a.m. 16.0 ppb (15) 3.0 ppb (3) N/A 13.0 ppb (12) N/A 1.0 ppb (1) 27.0 ppb (21) 0.16 ppb (2) N/A 3.0 μg/m3 (12) 21.0
 
March 28, 2020, 5 a.m. 26.0 ppb (24) 7.0 ppb (6) N/A 19.0 ppb (18) N/A 1.0 ppb (1) 20.0 ppb (15) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 24.0
 
March 28, 2020, 4 a.m. 45.0 ppb (42) 17.0 ppb (16) N/A 28.0 ppb (26) N/A 1.0 ppb (1) 11.0 ppb (8) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 42.0
 
March 28, 2020, 3 a.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 27.0 ppb (21) 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 28, 2020, 2 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 31.0 ppb (24) 0.18 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 28, 2020, 1 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 32.0 ppb (25) 0.18 ppb (2) N/A 0.0 μg/m3 (0) 25.0
 
March 28, 2020, midnight 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 33.0 ppb (25) 0.18 ppb (2) N/A -1.0 μg/m3 (0) 25.0
 
March 27, 2020, 11 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 34.0 ppb (26) 0.17 ppb (2) N/A -2.0 μg/m3 (0) 26.0
 
March 27, 2020, 10 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 38.0 ppb (29) 0.16 ppb (2) N/A N/A 29.0
 
March 27, 2020, 9 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 40.0 ppb (31) 0.15 ppb (2) N/A -4.0 μg/m3 (0) 31.0
 
March 27, 2020, 8 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 42.0 ppb (32) 0.15 ppb (2) N/A 0.0 μg/m3 (0) 32.0
 
March 27, 2020, 7 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 42.0 ppb (32) 0.15 ppb (2) N/A 2.0 μg/m3 (8) 32.0
 
March 27, 2020, 6 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 42.0 ppb (32) 0.15 ppb (2) N/A 0.0 μg/m3 (0) 32.0
 
March 27, 2020, 5 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 44.0 ppb (34) 0.15 ppb (2) N/A -1.0 μg/m3 (0) 34.0
 
March 27, 2020, 4 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 45.0 ppb (35) 0.13 ppb (1) N/A -1.0 μg/m3 (0) 35.0
 
March 27, 2020, 3 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 42.0 ppb (32) 0.15 ppb (2) N/A 0.0 μg/m3 (0) 32.0
 
March 27, 2020, 2 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 38.0 ppb (29) 0.17 ppb (2) N/A 2.0 μg/m3 (8) 29.0
 
March 27, 2020, 1 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 34.0 ppb (26) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 26.0
 
March 27, 2020, noon 24.0 ppb (22) 8.0 ppb (7) N/A 16.0 ppb (15) N/A 1.0 ppb (1) 21.0 ppb (16) 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 27, 2020, 11 a.m. 19.0 ppb (18) 4.0 ppb (4) N/A 16.0 ppb (15) N/A 1.0 ppb (1) 21.0 ppb (16) 0.28 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 27, 2020, 10 a.m. 17.0 ppb (16) 3.0 ppb (3) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 22.0 ppb (17) 0.26 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 27, 2020, 9 a.m. 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 25.0 ppb (19) 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 2020, 8 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 28.0 ppb (22) 0.22 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 27, 2020, 7 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 30.0 ppb (23) 0.2 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 2020, 6 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 29.0 ppb (22) 0.23 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 2020, 5 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 29.0 ppb (22) 0.23 ppb (3) N/A 7.0 μg/m3 (29) 29.0
 
March 27, 2020, 4 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 31.0 ppb (24) 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 27, 2020, 3 a.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A 1.0 ppb (1) 29.0 ppb (22) 0.23 ppb (3) N/A 5.0 μg/m3 (21) 22.0
 
March 27, 2020, 2 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 34.0 ppb (26) 0.23 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
March 27, 2020, 1 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 36.0 ppb (28) 0.23 ppb (3) N/A 4.0 μg/m3 (17) 28.0
 
March 27, 2020, midnight 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 35.0 ppb (27) 0.21 ppb (2) N/A 4.0 μg/m3 (17) 27.0
 
March 26, 2020, 11 p.m. 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 35.0 ppb (27) 0.2 ppb (2) N/A 4.0 μg/m3 (17) 27.0
 
March 26, 2020, 10 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 41.0 ppb (32) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 32.0
 
March 26, 2020, 9 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 42.0 ppb (32) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 32.0
 
March 26, 2020, 8 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 43.0 ppb (33) 0.18 ppb (2) N/A 4.0 μg/m3 (17) 33.0
 
March 26, 2020, 7 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 2.0 ppb (2) N/A 1.0 ppb (1) 44.0 ppb (34) 0.17 ppb (2) N/A 0.0 μg/m3 (0) 34.0
 
March 26, 2020, 6 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 43.0 ppb (33) 0.17 ppb (2) N/A 1.0 μg/m3 (4) 33.0
 
March 26, 2020, 5 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 40.0 ppb (31) 0.18 ppb (2) N/A 3.0 μg/m3 (12) 31.0
 
March 26, 2020, 4 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 40.0 ppb (31) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 31.0
 
March 26, 2020, 3 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 40.0 ppb (31) 0.19 ppb (2) N/A 3.0 μg/m3 (12) 31.0
 
March 26, 2020, 2 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A N/A 37.0 ppb (28) N/A N/A 5.0 μg/m3 (21) 28.0
 
March 26, 2020, 1 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 35.0 ppb (27) 0.17 ppb (2) N/A 6.0 μg/m3 (25) 27.0
 
March 26, 2020, noon 16.0 ppb (15) 5.0 ppb (5) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 27.0 ppb (21) 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 26, 2020, 11 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 26, 2020, 10 a.m. 17.0 ppb (16) 3.0 ppb (3) N/A 14.0 ppb (13) N/A 0.0 ppb (0) 22.0 ppb (17) N/A N/A 2.0 μg/m3 (8) 17.0
 
March 26, 2020, 9 a.m. 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A 0.0 ppb (0) N/A 0.22 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
March 26, 2020, 8 a.m. 15.0 ppb (14) 2.0 ppb (2) N/A 13.0 ppb (12) N/A 0.0 ppb (0) N/A 0.18 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
March 26, 2020, 7 a.m. N/A N/A N/A N/A N/A 1.0 ppb (1) 33.0 ppb (25) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 25.0
 
March 26, 2020, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 34.0 ppb (26) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 26.0
 
March 26, 2020, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) 36.0 ppb (28) 0.16 ppb (2) N/A 6.0 μg/m3 (25) 28.0
 
March 26, 2020, 4 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 34.0 ppb (26) 0.17 ppb (2) N/A 5.0 μg/m3 (21) 26.0
 
March 26, 2020, 3 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A 35.0 ppb (27) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 27.0
 
March 26, 2020, 2 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 36.0 ppb (28) 0.16 ppb (2) N/A 5.0 μg/m3 (21) 28.0
 
March 26, 2020, 1 a.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 36.0 ppb (28) 0.16 ppb (2) N/A 4.0 μg/m3 (17) 28.0
 
March 26, 2020, midnight 7.0 ppb (6) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 37.0 ppb (28) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 28.0
 
March 25, 2020, 11 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (28) 0.18 ppb (2) N/A 3.0 μg/m3 (12) 28.0
 
March 25, 2020, 10 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 37.0 ppb (28) 0.18 ppb (2) N/A 3.0 μg/m3 (12) 28.0
 
March 25, 2020, 9 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 38.0 ppb (29) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 29.0
 
March 25, 2020, 8 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 39.0 ppb (30) 0.16 ppb (2) N/A 2.0 μg/m3 (8) 30.0
 
March 25, 2020, 7 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 38.0 ppb (29) 0.17 ppb (2) N/A 2.0 μg/m3 (8) 29.0
 
March 25, 2020, 6 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 29.0
 
March 25, 2020, 5 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 39.0 ppb (30) 0.16 ppb (2) N/A 5.0 μg/m3 (21) 30.0
 
March 25, 2020, 4 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 38.0 ppb (29) 0.17 ppb (2) N/A 5.0 μg/m3 (21) 29.0
 
March 25, 2020, 3 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 36.0 ppb (28) 0.16 ppb (2) N/A 5.0 μg/m3 (21) 28.0
 
March 25, 2020, 2 p.m. 14.0 ppb (13) 3.0 ppb (3) N/A 11.0 ppb (10) N/A 1.0 ppb (1) 32.0 ppb (25) 0.18 ppb (2) N/A 5.0 μg/m3 (21) 25.0
 
March 25, 2020, 1 p.m. 13.0 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 31.0 ppb (24) 0.14 ppb (2) N/A 3.0 μg/m3 (12) 24.0
 
March 25, 2020, noon 13.0 ppb (12) 3.0 ppb (3) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 30.0 ppb (23) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 23.0
 
March 25, 2020, 11 a.m. 20.0 ppb (19) 3.0 ppb (3) N/A 17.0 ppb (16) N/A 0.0 ppb (0) 26.0 ppb (20) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 20.0
 
March 25, 2020, 10 a.m. 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 29.0 ppb (22) 0.18 ppb (2) N/A 5.0 μg/m3 (21) 22.0
 
March 25, 2020, 9 a.m. 16.0 ppb (15) 2.0 ppb (2) N/A 14.0 ppb (13) N/A 1.0 ppb (1) 28.0 ppb (22) 0.19 ppb (2) N/A 7.0 μg/m3 (29) 29.0
 
March 25, 2020, 8 a.m. 15.0 ppb (14) 2.0 ppb (2) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 26.0 ppb (20) 0.2 ppb (2) N/A 3.0 μg/m3 (12) 20.0
 
March 25, 2020, 7 a.m. 12.0 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 29.0 ppb (22) 0.19 ppb (2) N/A 5.0 μg/m3 (21) 22.0
 
March 25, 2020, 6 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 31.0 ppb (24) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 24.0
 
March 25, 2020, 5 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 33.0 ppb (25) 0.18 ppb (2) N/A 3.0 μg/m3 (12) 25.0
 
March 25, 2020, 4 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 10.0 ppb (9) N/A 1.0 ppb (1) 30.0 ppb (23) 0.19 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 25, 2020, 3 a.m. 13.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 29.0 ppb (22) 0.21 ppb (2) N/A 8.0 μg/m3 (33) 33.0
 
March 25, 2020, 2 a.m. 12.0 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A 0.0 ppb (0) 31.0 ppb (24) 0.19 ppb (2) N/A 5.0 μg/m3 (21) 24.0
 
March 25, 2020, 1 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 32.0 ppb (25) 0.17 ppb (2) N/A 5.0 μg/m3 (21) 25.0
 
March 25, 2020, midnight 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 33.0 ppb (25) 0.16 ppb (2) N/A 4.0 μg/m3 (17) 25.0
 
March 24, 2020, 11 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (28) 0.15 ppb (2) N/A 0.0 μg/m3 (0) 28.0
 
March 24, 2020, 10 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 38.0 ppb (29) 0.15 ppb (2) N/A 0.0 μg/m3 (0) 29.0
 
March 24, 2020, 9 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 39.0 ppb (30) 0.16 ppb (2) N/A 0.0 μg/m3 (0) 30.0
 
March 24, 2020, 8 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 39.0 ppb (30) 0.16 ppb (2) N/A 1.0 μg/m3 (4) 30.0
 
March 24, 2020, 7 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 40.0 ppb (31) 0.17 ppb (2) N/A 2.0 μg/m3 (8) 31.0
 
March 24, 2020, 6 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 41.0 ppb (32) 0.18 ppb (2) N/A 2.0 μg/m3 (8) 32.0
 
March 24, 2020, 5 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 39.0 ppb (30) 0.17 ppb (2) N/A 2.0 μg/m3 (8) 30.0
 
March 24, 2020, 4 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 38.0 ppb (29) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 29.0
 
March 24, 2020, 3 p.m. 9.0 ppb (8) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 36.0 ppb (28) 0.18 ppb (2) N/A 3.0 μg/m3 (12) 28.0
 
March 24, 2020, 2 p.m. 9.0 ppb (8) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 35.0 ppb (27) 0.19 ppb (2) N/A 6.0 μg/m3 (25) 27.0
 
March 24, 2020, 1 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 32.0 ppb (25) 0.21 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
March 24, 2020, noon 12.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 29.0 ppb (22) 0.22 ppb (2) N/A 4.0 μg/m3 (17) 22.0
 
March 24, 2020, 11 a.m. 12.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 28.0 ppb (22) 0.19 ppb (2) N/A 2.0 μg/m3 (8) 22.0
 
March 24, 2020, 10 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 30.0 ppb (23) 0.18 ppb (2) N/A 1.0 μg/m3 (4) 23.0
 
March 24, 2020, 9 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (7) N/A 1.0 ppb (1) 31.0 ppb (24) 0.18 ppb (2) N/A 1.0 μg/m3 (4) 24.0
 
March 24, 2020, 8 a.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 1.0 ppb (1) 32.0 ppb (25) 0.18 ppb (2) N/A 2.0 μg/m3 (8) 25.0
 
March 24, 2020, 7 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 34.0 ppb (26) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 26.0
 
March 24, 2020, 6 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 35.0 ppb (27) 0.16 ppb (2) N/A 3.0 μg/m3 (12) 27.0
 
March 24, 2020, 5 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 37.0 ppb (28) 0.15 ppb (2) N/A -4.0 μg/m3 (0) 28.0
 
March 24, 2020, 4 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 37.0 ppb (28) 0.15 ppb (2) N/A N/A 28.0
 
March 24, 2020, 3 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A 1.0 ppb (1) 34.0 ppb (26) 0.17 ppb (2) N/A 1.0 μg/m3 (4) 26.0
 
March 24, 2020, 2 a.m. 11.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (8) N/A 1.0 ppb (1) 33.0 ppb (25) 0.18 ppb (2) N/A 4.0 μg/m3 (17) 25.0
 
March 24, 2020, 1 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 1.0 ppb (1) 39.0 ppb (30) 0.16 ppb (2) N/A 4.0 μg/m3 (17) 30.0
 
March 24, 2020, midnight 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 1.0 ppb (1) 40.0 ppb (31) 0.15 ppb (2) N/A 5.0 μg/m3 (21) 31.0
 
March 23, 2020, 11 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 37.0 ppb (28) 0.16 ppb (2) N/A 1.0 μg/m3 (4) 28.0
 
March 23, 2020, 10 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 37.0 ppb (28) 0.17 ppb (2) N/A -1.0 μg/m3 (0) 28.0
 
March 23, 2020, 9 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (28) 0.19 ppb (2) N/A 1.0 μg/m3 (4) 28.0
 
March 23, 2020, 8 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 34.0 ppb (26) 0.2 ppb (2) N/A 4.0 μg/m3 (17) 26.0
 
March 23, 2020, 7 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (28) 0.19 ppb (2) N/A 5.0 μg/m3 (21) 28.0
 
March 23, 2020, 6 p.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 38.0 ppb (29) 0.17 ppb (2) N/A 2.0 μg/m3 (8) 29.0
 
March 23, 2020, 5 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 39.0 ppb (30) 0.17 ppb (2) N/A 3.0 μg/m3 (12) 30.0
 
March 23, 2020, 4 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 1.0 ppb (1) 39.0 ppb (30) 0.17 ppb (2) N/A 4.0 μg/m3 (17) 30.0
 
March 23, 2020, 3 p.m. 7.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 39.0 ppb (30) 0.17 ppb (2) N/A 6.0 μg/m3 (25) 30.0