ID: 485

AQSQID: 250250042

Site Name: Boston - Roxbury

Added: April 21, 2020, 6:24 p.m.

Updated: May 14, 2021, 7:47 a.m.

Location: Roxbury (Roxbury), MA

Reporting: True, Located: True

Current AQI: 30.0

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
May 14, 2021, 5 a.m. N/A N/A 19.5 ppb (19) N/A N/A 0.0 ppb (0) 18.0 ppb (17) 0.27 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
May 14, 2021, 4 a.m. 24.0 ppb (23) 1.0 ppb (1) 25.1 ppb (24) 22.0 ppb (21) N/A N/A 16.0 ppb (15) 0.29 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
May 14, 2021, 3 a.m. 17.0 ppb (17) 1.0 ppb (1) 18.0 ppb (17) 16.0 ppb (16) N/A N/A 23.0 ppb (22) 0.27 ppb (4) N/A 4.0 μg/m3 (17) 22.0
 
May 14, 2021, 2 a.m. 8.0 ppb (8) 0.0 ppb (0) 9.2 ppb (9) 8.0 ppb (8) N/A N/A 33.0 ppb (31) 0.2 ppb (3) N/A 3.0 μg/m3 (13) 31.0
 
May 14, 2021, 1 a.m. 11.0 ppb (11) 0.0 ppb (0) 10.9 ppb (11) 11.0 ppb (11) N/A 0.0 ppb (0) 31.0 ppb (29) 0.27 ppb (4) N/A 5.0 μg/m3 (21) 29.0
 
May 14, 2021, midnight 16.0 ppb (16) 1.0 ppb (1) N/A 15.0 ppb (15) N/A 0.0 ppb (0) 29.0 ppb (27) 0.3 ppb (4) N/A 1.0 μg/m3 (5) 27.0
 
May 13, 2021, 11 p.m. 10.0 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (9) N/A 0.0 ppb (0) 37.0 ppb (35) 0.2 ppb (3) N/A 4.0 μg/m3 (17) 35.0
 
May 13, 2021, 10 p.m. 9.0 ppb (9) 1.0 ppb (1) N/A 7.0 ppb (7) N/A 0.0 ppb (0) 40.0 ppb (38) 0.18 ppb (3) N/A 5.0 μg/m3 (21) 38.0
 
May 13, 2021, 9 p.m. 6.0 ppb (6) 1.0 ppb (1) 5.9 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 42.0 ppb (39) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 39.0
 
May 13, 2021, 8 p.m. 7.0 ppb (7) 2.0 ppb (2) 7.3 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 40.0 ppb (38) 0.13 ppb (2) N/A 4.0 μg/m3 (17) 38.0
 
May 13, 2021, 7 p.m. 9.0 ppb (9) 3.0 ppb (3) 9.6 ppb (10) 7.0 ppb (7) N/A 0.0 ppb (0) 37.0 ppb (35) 0.17 ppb (3) N/A 4.0 μg/m3 (17) 35.0
 
May 13, 2021, 6 p.m. 8.0 ppb (8) 2.0 ppb (2) 8.1 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 37.0 ppb (35) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 35.0
 
May 13, 2021, 5 p.m. 11.0 ppb (11) 3.0 ppb (3) 12.7 ppb (12) 8.0 ppb (8) N/A 0.0 ppb (0) 34.0 ppb (32) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 32.0
 
May 13, 2021, 4 p.m. 8.0 ppb (8) 2.0 ppb (2) 8.7 ppb (9) 6.0 ppb (6) N/A 0.0 ppb (0) 37.0 ppb (35) 0.14 ppb (2) N/A 1.0 μg/m3 (5) 35.0
 
May 13, 2021, 3 p.m. 12.0 ppb (12) 4.0 ppb (4) 11.7 ppb (12) 8.0 ppb (8) N/A 0.0 ppb (0) 33.0 ppb (31) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 31.0
 
May 13, 2021, 2 p.m. 8.0 ppb (8) 2.0 ppb (2) 8.6 ppb (9) 5.0 ppb (5) N/A 0.0 ppb (0) 33.0 ppb (31) 0.15 ppb (2) N/A 5.0 μg/m3 (21) 31.0
 
May 13, 2021, 1 p.m. 15.0 ppb (15) 6.0 ppb (6) 16.4 ppb (16) 10.0 ppb (10) N/A 0.0 ppb (0) 28.0 ppb (26) 0.17 ppb (3) N/A 6.0 μg/m3 (25) 26.0
 
May 13, 2021, noon 22.0 ppb (21) 9.0 ppb (9) 21.9 ppb (21) 13.0 ppb (13) N/A 0.0 ppb (0) 22.0 ppb (21) 0.2 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
May 13, 2021, 11 a.m. 25.0 ppb (24) 10.0 ppb (10) 26.2 ppb (25) 15.0 ppb (15) N/A 0.0 ppb (0) 16.0 ppb (15) 0.22 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 13, 2021, 10 a.m. 44.0 ppb (42) 19.0 ppb (18) 45.0 ppb (43) 25.0 ppb (24) N/A 1.0 ppb (2) 8.0 ppb (8) 0.35 ppb (4) N/A 7.0 μg/m3 (30) 43.0
 
May 13, 2021, 9 a.m. 31.0 ppb (30) 8.0 ppb (8) 32.3 ppb (31) 23.0 ppb (22) N/A 0.0 ppb (0) 7.0 ppb (7) 0.36 ppb (5) N/A 4.0 μg/m3 (17) 31.0
 
May 13, 2021, 8 a.m. 22.0 ppb (21) 2.0 ppb (2) 23.8 ppb (23) 20.0 ppb (19) N/A 0.0 ppb (0) 9.0 ppb (9) 0.32 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
May 13, 2021, 7 a.m. 21.0 ppb (20) 1.0 ppb (1) 22.3 ppb (22) 20.0 ppb (19) N/A 0.0 ppb (0) 12.0 ppb (12) 0.32 ppb (4) N/A 4.0 μg/m3 (17) 22.0
 
May 13, 2021, 6 a.m. 30.0 ppb (29) 5.0 ppb (5) 30.5 ppb (29) 24.0 ppb (23) N/A 0.0 ppb (0) 11.0 ppb (11) 0.32 ppb (4) N/A 4.0 μg/m3 (17) 29.0
 
May 13, 2021, 5 a.m. 26.0 ppb (25) 6.0 ppb (6) 29.5 ppb (28) 20.0 ppb (19) N/A 0.0 ppb (0) 16.0 ppb (15) 0.23 ppb (3) N/A 6.0 μg/m3 (25) 28.0
 
May 13, 2021, 4 a.m. 35.0 ppb (34) 7.0 ppb (7) 36.5 ppb (35) 28.0 ppb (27) N/A 0.0 ppb (0) 12.0 ppb (12) 0.27 ppb (4) N/A 4.0 μg/m3 (17) 35.0
 
May 13, 2021, 3 a.m. 24.0 ppb (23) 1.0 ppb (1) 25.3 ppb (24) 23.0 ppb (22) N/A 0.0 ppb (0) 15.0 ppb (14) 0.34 ppb (4) N/A 3.0 μg/m3 (13) 24.0
 
May 13, 2021, 2 a.m. 14.0 ppb (14) 1.0 ppb (1) 14.9 ppb (15) 13.0 ppb (13) N/A 0.0 ppb (0) 27.0 ppb (25) 0.24 ppb (3) N/A 3.0 μg/m3 (13) 25.0
 
May 13, 2021, 1 a.m. 12.0 ppb (12) 1.0 ppb (1) 11.8 ppb (12) 11.0 ppb (11) N/A 0.0 ppb (0) 30.0 ppb (28) 0.2 ppb (3) N/A 0.0 μg/m3 (0) 28.0
 
May 13, 2021, midnight 9.0 ppb (9) 1.0 ppb (1) 8.5 ppb (9) 8.0 ppb (8) N/A 0.0 ppb (0) 35.0 ppb (33) 0.17 ppb (3) N/A -1.0 μg/m3 (0) 33.0
 
May 12, 2021, 11 p.m. 7.0 ppb (7) 1.0 ppb (1) 6.6 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 38.0 ppb (36) 0.14 ppb (2) N/A 1.0 μg/m3 (5) 36.0
 
May 12, 2021, 10 p.m. 10.0 ppb (10) 2.0 ppb (2) 10.9 ppb (11) 8.0 ppb (8) N/A 0.0 ppb (0) 33.0 ppb (31) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 31.0
 
May 12, 2021, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) 5.1 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 37.0 ppb (35) 0.14 ppb (2) N/A 1.0 μg/m3 (5) 35.0
 
May 12, 2021, 8 p.m. 7.0 ppb (7) 2.0 ppb (2) 7.7 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 34.0 ppb (32) 0.17 ppb (3) N/A 1.0 μg/m3 (5) 32.0
 
May 12, 2021, 7 p.m. 8.0 ppb (8) 2.0 ppb (2) 9.1 ppb (9) 6.0 ppb (6) N/A 0.0 ppb (0) 33.0 ppb (31) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 31.0
 
May 12, 2021, 6 p.m. 10.0 ppb (10) 3.0 ppb (3) 10.3 ppb (10) 7.0 ppb (7) N/A 0.0 ppb (0) 35.0 ppb (33) 0.15 ppb (2) N/A 4.0 μg/m3 (17) 33.0
 
May 12, 2021, 5 p.m. 9.0 ppb (9) 3.0 ppb (3) 9.6 ppb (10) 6.0 ppb (6) N/A 0.0 ppb (0) 35.0 ppb (33) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 33.0
 
May 12, 2021, 4 p.m. 8.0 ppb (8) 3.0 ppb (3) 8.7 ppb (9) 5.0 ppb (5) N/A 0.0 ppb (0) 32.0 ppb (30) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 30.0
 
May 12, 2021, 3 p.m. 9.0 ppb (9) 3.0 ppb (3) 9.2 ppb (9) 5.0 ppb (5) N/A 0.0 ppb (0) 28.0 ppb (26) 0.12 ppb (2) N/A 4.0 μg/m3 (17) 26.0
 
May 12, 2021, 2 p.m. 9.0 ppb (9) 4.0 ppb (4) 10.0 ppb (10) 5.0 ppb (5) N/A N/A 25.0 ppb (24) 0.12 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 12, 2021, 1 p.m. 11.0 ppb (11) 5.0 ppb (5) 11.7 ppb (12) 6.0 ppb (6) N/A 0.0 ppb (0) 22.0 ppb (21) 0.14 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
May 12, 2021, noon 14.0 ppb (14) 7.0 ppb (7) 13.7 ppb (13) 7.0 ppb (7) N/A 0.0 ppb (0) 21.0 ppb (20) 0.17 ppb (3) N/A 4.0 μg/m3 (17) 20.0
 
May 12, 2021, 11 a.m. 13.0 ppb (13) 5.0 ppb (5) 13.1 ppb (13) 8.0 ppb (8) N/A 0.0 ppb (0) 21.0 ppb (20) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 20.0
 
May 12, 2021, 10 a.m. 13.0 ppb (13) 4.0 ppb (4) 13.9 ppb (14) 9.0 ppb (9) N/A 0.0 ppb (0) 21.0 ppb (20) 0.17 ppb (3) N/A 3.0 μg/m3 (13) 20.0
 
May 12, 2021, 9 a.m. 9.0 ppb (9) 2.0 ppb (2) 8.5 ppb (9) 7.0 ppb (7) N/A 0.0 ppb (0) 24.0 ppb (23) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 23.0
 
May 12, 2021, 8 a.m. 4.0 ppb (4) 0.0 ppb (0) 4.4 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 26.0 ppb (25) 0.13 ppb (2) N/A 2.0 μg/m3 (9) 25.0
 
May 12, 2021, 7 a.m. 5.0 ppb (5) 1.0 ppb (1) 6.1 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 26.0 ppb (25) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 25.0
 
May 12, 2021, 6 a.m. 4.0 ppb (4) 0.0 ppb (0) 4.7 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 28.0 ppb (26) 0.14 ppb (2) N/A 3.0 μg/m3 (13) 26.0
 
May 12, 2021, 5 a.m. 4.0 ppb (4) 1.0 ppb (1) 5.1 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 28.0 ppb (26) 0.18 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
May 12, 2021, 4 a.m. 6.0 ppb (6) 1.0 ppb (1) 6.3 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 29.0 ppb (27) 0.18 ppb (3) N/A 4.0 μg/m3 (17) 27.0
 
May 12, 2021, 3 a.m. 6.0 ppb (6) 1.0 ppb (1) 6.9 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 30.0 ppb (28) 0.14 ppb (2) N/A 5.0 μg/m3 (21) 28.0
 
May 12, 2021, 2 a.m. 6.0 ppb (6) 1.0 ppb (1) 6.3 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 33.0 ppb (31) 0.16 ppb (3) N/A 6.0 μg/m3 (25) 31.0
 
May 12, 2021, 1 a.m. 8.0 ppb (8) 1.0 ppb (1) 8.3 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 32.0 ppb (30) 0.18 ppb (3) N/A 2.0 μg/m3 (9) 30.0
 
May 12, 2021, midnight 9.0 ppb (9) 1.0 ppb (1) 10.0 ppb (10) 8.0 ppb (8) N/A 0.0 ppb (0) 30.0 ppb (28) 0.18 ppb (3) N/A -1.0 μg/m3 (0) 28.0
 
May 11, 2021, 11 p.m. 5.0 ppb (5) 1.0 ppb (1) 5.8 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 35.0 ppb (33) 0.19 ppb (3) N/A 0.0 μg/m3 (0) 33.0
 
May 11, 2021, 10 p.m. 6.0 ppb (6) 2.0 ppb (2) 6.3 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 36.0 ppb (34) 0.18 ppb (3) N/A 3.0 μg/m3 (13) 34.0
 
May 11, 2021, 9 p.m. 7.0 ppb (7) 2.0 ppb (2) 7.2 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 36.0 ppb (34) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 34.0
 
May 11, 2021, 8 p.m. 7.0 ppb (7) 2.0 ppb (2) 7.0 ppb (7) 4.0 ppb (4) N/A 0.0 ppb (0) 35.0 ppb (33) 0.17 ppb (3) N/A 3.0 μg/m3 (13) 33.0
 
May 11, 2021, 7 p.m. 9.0 ppb (9) 3.0 ppb (3) 10.3 ppb (10) 6.0 ppb (6) N/A 0.0 ppb (0) 33.0 ppb (31) 0.16 ppb (3) N/A 4.0 μg/m3 (17) 31.0
 
May 11, 2021, 6 p.m. 7.0 ppb (7) 2.0 ppb (2) 7.4 ppb (7) 4.0 ppb (4) N/A 0.0 ppb (0) 35.0 ppb (33) 0.16 ppb (3) N/A 4.0 μg/m3 (17) 33.0
 
May 11, 2021, 5 p.m. 14.0 ppb (14) 7.0 ppb (7) 7.7 ppb (8) 6.0 ppb (6) N/A 1.0 ppb (2) 34.0 ppb (32) 0.15 ppb (2) N/A 0.0 μg/m3 (0) 32.0
 
May 11, 2021, 4 p.m. 6.0 ppb (6) 2.0 ppb (2) 7.5 ppb (8) 4.0 ppb (4) N/A 0.0 ppb (0) 34.0 ppb (32) 0.14 ppb (2) N/A 3.0 μg/m3 (13) 32.0
 
May 11, 2021, 3 p.m. 13.0 ppb (13) 5.0 ppb (5) 10.2 ppb (10) 7.0 ppb (7) N/A 0.0 ppb (0) 33.0 ppb (31) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 31.0
 
May 11, 2021, 2 p.m. 7.0 ppb (7) 3.0 ppb (3) 8.1 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 33.0 ppb (31) 0.15 ppb (2) N/A 5.0 μg/m3 (21) 31.0
 
May 11, 2021, 1 p.m. 7.0 ppb (7) 2.0 ppb (2) 7.0 ppb (7) 4.0 ppb (4) N/A 0.0 ppb (0) 34.0 ppb (32) 0.15 ppb (2) N/A 6.0 μg/m3 (25) 32.0
 
May 11, 2021, noon 10.0 ppb (10) 3.0 ppb (3) 11.0 ppb (11) 7.0 ppb (7) N/A 0.0 ppb (0) 30.0 ppb (28) 0.18 ppb (3) N/A 1.0 μg/m3 (5) 28.0
 
May 11, 2021, 11 a.m. 12.0 ppb (12) 3.0 ppb (3) 11.8 ppb (12) 9.0 ppb (9) N/A 0.0 ppb (0) 28.0 ppb (26) 0.18 ppb (3) N/A 2.0 μg/m3 (9) 26.0
 
May 11, 2021, 10 a.m. 19.0 ppb (18) 4.0 ppb (4) 20.4 ppb (20) 15.0 ppb (15) N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0
 
May 11, 2021, 9 a.m. 10.0 ppb (10) 1.0 ppb (1) 10.9 ppb (11) 8.0 ppb (8) N/A 0.0 ppb (0) 25.0 ppb (24) 0.19 ppb (3) N/A 4.0 μg/m3 (17) 24.0
 
May 11, 2021, 8 a.m. 6.0 ppb (6) 0.0 ppb (0) 7.0 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.16 ppb (3) N/A 3.0 μg/m3 (13) 13.0
 
May 11, 2021, 7 a.m. N/A N/A 7.4 ppb (7) N/A N/A 0.0 ppb (0) 27.0 ppb (25) 0.18 ppb (3) N/A 3.0 μg/m3 (13) 25.0
 
May 11, 2021, 6 a.m. N/A N/A 6.2 ppb (6) N/A N/A 0.0 ppb (0) 26.0 ppb (25) 0.19 ppb (3) N/A 3.0 μg/m3 (13) 25.0
 
May 11, 2021, 5 a.m. N/A N/A 9.5 ppb (9) N/A N/A 0.0 ppb (0) 25.0 ppb (24) 0.19 ppb (3) N/A 3.0 μg/m3 (13) 24.0
 
May 11, 2021, 4 a.m. 7.0 ppb (7) 1.0 ppb (1) 7.3 ppb (7) 6.0 ppb (6) N/A N/A 27.0 ppb (25) 0.21 ppb (3) N/A 3.0 μg/m3 (13) 25.0
 
May 11, 2021, 3 a.m. 8.0 ppb (8) 0.0 ppb (0) 9.2 ppb (9) 8.0 ppb (8) N/A N/A 28.0 ppb (26) 0.2 ppb (3) N/A 5.0 μg/m3 (21) 26.0
 
May 11, 2021, 2 a.m. 10.0 ppb (10) 0.0 ppb (0) 11.3 ppb (11) 10.0 ppb (10) N/A N/A 29.0 ppb (27) 0.21 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
May 11, 2021, 1 a.m. 9.0 ppb (9) 0.0 ppb (0) 9.6 ppb (10) 9.0 ppb (9) N/A 0.0 ppb (0) 33.0 ppb (31) 0.22 ppb (3) N/A 6.0 μg/m3 (25) 31.0
 
May 11, 2021, midnight 12.0 ppb (12) 0.0 ppb (0) N/A 11.0 ppb (11) N/A 0.0 ppb (0) 32.0 ppb (30) 0.41 ppb (5) N/A 3.0 μg/m3 (13) 30.0
 
May 10, 2021, 11 p.m. 15.0 ppb (15) 1.0 ppb (1) N/A 14.0 ppb (14) N/A 0.0 ppb (0) 29.0 ppb (27) 0.31 ppb (4) N/A 0.0 μg/m3 (0) 27.0
 
May 10, 2021, 10 p.m. 11.0 ppb (11) 1.0 ppb (1) N/A 9.0 ppb (9) N/A 0.0 ppb (0) 34.0 ppb (32) 0.22 ppb (3) N/A 2.0 μg/m3 (9) 32.0
 
May 10, 2021, 9 p.m. 13.0 ppb (13) 2.0 ppb (2) 13.4 ppb (13) 10.0 ppb (10) N/A 0.0 ppb (0) 37.0 ppb (35) 0.21 ppb (3) N/A 5.0 μg/m3 (21) 35.0
 
May 10, 2021, 8 p.m. 11.0 ppb (11) 2.0 ppb (2) 12.7 ppb (12) 9.0 ppb (9) N/A 0.0 ppb (0) 39.0 ppb (37) 0.21 ppb (3) N/A 6.0 μg/m3 (25) 37.0
 
May 10, 2021, 7 p.m. 8.0 ppb (8) 1.0 ppb (1) 9.4 ppb (9) 7.0 ppb (7) N/A 0.0 ppb (0) 38.0 ppb (36) 0.19 ppb (3) N/A 5.0 μg/m3 (21) 36.0
 
May 10, 2021, 6 p.m. 8.0 ppb (8) 2.0 ppb (2) 8.8 ppb (9) 6.0 ppb (6) N/A 0.0 ppb (0) 39.0 ppb (37) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 37.0
 
May 10, 2021, 5 p.m. 11.0 ppb (11) 2.0 ppb (2) 11.4 ppb (11) 8.0 ppb (8) N/A 0.0 ppb (0) 36.0 ppb (34) 0.17 ppb (3) N/A 6.0 μg/m3 (25) 34.0
 
May 10, 2021, 4 p.m. 9.0 ppb (9) 2.0 ppb (2) 9.8 ppb (10) 7.0 ppb (7) N/A 0.0 ppb (0) 36.0 ppb (34) 0.17 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
May 10, 2021, 3 p.m. 21.0 ppb (20) 8.0 ppb (8) 18.4 ppb (18) 12.0 ppb (12) N/A 0.0 ppb (0) 32.0 ppb (30) 0.21 ppb (3) N/A 5.0 μg/m3 (21) 30.0
 
May 10, 2021, 2 p.m. 20.0 ppb (19) 6.0 ppb (6) 17.8 ppb (17) 13.0 ppb (13) N/A 0.0 ppb (0) 32.0 ppb (30) 0.2 ppb (3) N/A 5.0 μg/m3 (21) 30.0
 
May 10, 2021, 1 p.m. 14.0 ppb (14) 3.0 ppb (3) 16.5 ppb (16) 11.0 ppb (11) N/A 0.0 ppb (0) 35.0 ppb (33) 0.17 ppb (3) N/A 4.0 μg/m3 (17) 33.0
 
May 10, 2021, noon 16.0 ppb (16) 4.0 ppb (4) 15.4 ppb (15) 12.0 ppb (12) N/A 0.0 ppb (0) 36.0 ppb (34) 0.18 ppb (3) N/A 4.0 μg/m3 (17) 34.0
 
May 10, 2021, 11 a.m. 18.0 ppb (17) 3.0 ppb (3) 17.4 ppb (17) 15.0 ppb (15) N/A 0.0 ppb (0) 29.0 ppb (27) 0.22 ppb (3) N/A 5.0 μg/m3 (21) 27.0
 
May 10, 2021, 10 a.m. 19.0 ppb (18) 2.0 ppb (2) 19.2 ppb (19) 16.0 ppb (16) N/A 0.0 ppb (0) 27.0 ppb (25) 0.21 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 10, 2021, 9 a.m. 13.0 ppb (13) 0.0 ppb (0) 13.9 ppb (14) 13.0 ppb (13) N/A 0.0 ppb (0) 28.0 ppb (26) 0.17 ppb (3) N/A 5.0 μg/m3 (21) 26.0
 
May 10, 2021, 8 a.m. 5.0 ppb (5) 0.0 ppb (0) 5.8 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 34.0 ppb (32) 0.14 ppb (2) N/A 3.0 μg/m3 (13) 32.0
 
May 10, 2021, 7 a.m. 5.0 ppb (5) 0.0 ppb (0) 5.9 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 33.0 ppb (31) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 31.0
 
May 10, 2021, 6 a.m. 7.0 ppb (7) 0.0 ppb (0) 7.7 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 33.0 ppb (31) 0.17 ppb (3) N/A 5.0 μg/m3 (21) 31.0
 
May 10, 2021, 5 a.m. 7.0 ppb (7) 0.0 ppb (0) 8.3 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 37.0 ppb (35) 0.18 ppb (3) N/A 5.0 μg/m3 (21) 35.0
 
May 10, 2021, 4 a.m. 6.0 ppb (6) 0.0 ppb (0) 6.7 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 39.0 ppb (37) 0.17 ppb (3) N/A 1.0 μg/m3 (5) 37.0
 
May 10, 2021, 3 a.m. 4.0 ppb (4) 0.0 ppb (0) 5.5 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 41.0 ppb (38) 0.18 ppb (3) N/A 2.0 μg/m3 (9) 38.0
 
May 10, 2021, 2 a.m. 3.0 ppb (3) 0.0 ppb (0) 4.3 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (40) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 40.0
 
May 10, 2021, 1 a.m. 4.0 ppb (4) 0.0 ppb (0) 4.6 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 44.0 ppb (41) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 41.0
 
May 10, 2021, midnight 5.0 ppb (5) 0.0 ppb (0) 6.4 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 40.0 ppb (38) 0.2 ppb (3) N/A 4.0 μg/m3 (17) 38.0
 
May 9, 2021, 11 p.m. 6.0 ppb (6) 0.0 ppb (0) 6.8 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 36.0 ppb (34) 0.21 ppb (3) N/A 5.0 μg/m3 (21) 34.0
 
May 9, 2021, 10 p.m. 4.0 ppb (4) 0.0 ppb (0) 4.5 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (38) 0.18 ppb (3) N/A 6.0 μg/m3 (25) 38.0
 
May 9, 2021, 9 p.m. 3.0 ppb (3) 0.0 ppb (0) 3.8 ppb (4) 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (38) 0.19 ppb (3) N/A 1.0 μg/m3 (5) 38.0
 
May 9, 2021, 8 p.m. 2.0 ppb (2) 0.0 ppb (0) 3.2 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (38) 0.16 ppb (3) N/A 2.0 μg/m3 (9) 38.0
 
May 9, 2021, 7 p.m. 2.0 ppb (2) 1.0 ppb (1) 3.1 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (38) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 38.0
 
May 9, 2021, 6 p.m. 2.0 ppb (2) 0.0 ppb (0) 3.0 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (38) 0.16 ppb (3) N/A 4.0 μg/m3 (17) 38.0
 
May 9, 2021, 5 p.m. 2.0 ppb (2) 1.0 ppb (1) 3.1 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 39.0 ppb (37) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 37.0
 
May 9, 2021, 4 p.m. 2.0 ppb (2) 0.0 ppb (0) 3.1 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 38.0 ppb (36) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 36.0
 
May 9, 2021, 3 p.m. 2.0 ppb (2) 1.0 ppb (1) 2.9 ppb (3) 2.0 ppb (2) N/A 0.0 ppb (0) 37.0 ppb (35) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 35.0
 
May 9, 2021, 2 p.m. 3.0 ppb (3) 1.0 ppb (1) 3.6 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 35.0 ppb (33) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 33.0
 
May 9, 2021, 1 p.m. 4.0 ppb (4) 1.0 ppb (1) 4.8 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 33.0 ppb (31) 0.13 ppb (2) N/A 6.0 μg/m3 (25) 31.0
 
May 9, 2021, noon 13.0 ppb (13) 5.0 ppb (5) 13.3 ppb (13) 8.0 ppb (8) N/A 0.0 ppb (0) 26.0 ppb (25) 0.14 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
May 9, 2021, 11 a.m. 14.0 ppb (14) 5.0 ppb (5) 14.8 ppb (14) 9.0 ppb (9) N/A 0.0 ppb (0) 23.0 ppb (22) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 22.0
 
May 9, 2021, 10 a.m. 5.0 ppb (5) 1.0 ppb (1) 5.8 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 26.0 ppb (25) 0.17 ppb (3) N/A 1.0 μg/m3 (5) 25.0
 
May 9, 2021, 9 a.m. 6.0 ppb (6) 0.0 ppb (0) 6.5 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 26.0 ppb (25) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 25.0
 
May 9, 2021, 8 a.m. 4.0 ppb (4) 0.0 ppb (0) 4.5 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 29.0 ppb (27) 0.17 ppb (3) N/A 3.0 μg/m3 (13) 27.0
 
May 9, 2021, 7 a.m. 4.0 ppb (4) 0.0 ppb (0) 4.4 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 29.0 ppb (27) 0.17 ppb (3) N/A 0.0 μg/m3 (0) 27.0
 
May 9, 2021, 6 a.m. 4.0 ppb (4) 0.0 ppb (0) 4.7 ppb (5) 4.0 ppb (4) N/A 0.0 ppb (0) 29.0 ppb (27) 0.17 ppb (3) N/A -1.0 μg/m3 (0) 27.0
 
May 9, 2021, 5 a.m. 5.0 ppb (5) 0.0 ppb (0) 5.5 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 27.0 ppb (25) 0.19 ppb (3) N/A 3.0 μg/m3 (13) 25.0
 
May 9, 2021, 4 a.m. 5.0 ppb (5) 0.0 ppb (0) 5.5 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 28.0 ppb (26) 0.2 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
May 9, 2021, 3 a.m. 5.0 ppb (5) 0.0 ppb (0) 5.7 ppb (6) 5.0 ppb (5) N/A 0.0 ppb (0) 29.0 ppb (27) 0.17 ppb (3) N/A 4.0 μg/m3 (17) 27.0
 
May 9, 2021, 2 a.m. 6.0 ppb (6) 0.0 ppb (0) 7.3 ppb (7) 6.0 ppb (6) N/A 0.0 ppb (0) 28.0 ppb (26) 0.19 ppb (3) N/A 4.0 μg/m3 (17) 26.0
 
May 9, 2021, 1 a.m. 7.0 ppb (7) 1.0 ppb (1) 8.2 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 25.0 ppb (24) 0.22 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
May 9, 2021, midnight 7.0 ppb (7) 1.0 ppb (1) 8.1 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 26.0 ppb (25) 0.24 ppb (3) N/A 5.0 μg/m3 (21) 25.0
 
May 8, 2021, 11 p.m. 10.0 ppb (10) 1.0 ppb (1) 11.3 ppb (11) 9.0 ppb (9) N/A 0.0 ppb (0) 22.0 ppb (21) 0.25 ppb (3) N/A 3.0 μg/m3 (13) 21.0
 
May 8, 2021, 10 p.m. 7.0 ppb (7) 1.0 ppb (1) 7.7 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 24.0 ppb (23) 0.2 ppb (3) N/A 4.0 μg/m3 (17) 23.0
 
May 8, 2021, 9 p.m. 5.0 ppb (5) 1.0 ppb (1) 5.1 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 27.0 ppb (25) 0.18 ppb (3) N/A 0.0 μg/m3 (0) 25.0
 
May 8, 2021, 8 p.m. 3.0 ppb (3) 1.0 ppb (1) 3.9 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 28.0 ppb (26) 0.16 ppb (3) N/A 1.0 μg/m3 (5) 26.0
 
May 8, 2021, 7 p.m. 3.0 ppb (3) 1.0 ppb (1) 3.4 ppb (4) 2.0 ppb (2) N/A 0.0 ppb (0) 29.0 ppb (27) 0.15 ppb (2) N/A 2.0 μg/m3 (9) 27.0
 
May 8, 2021, 6 p.m. 4.0 ppb (4) 2.0 ppb (2) 4.9 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 29.0 ppb (27) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 27.0
 
May 8, 2021, 5 p.m. 4.0 ppb (4) 2.0 ppb (2) 4.9 ppb (5) 3.0 ppb (3) N/A 0.0 ppb (0) 29.0 ppb (27) 0.17 ppb (3) N/A 3.0 μg/m3 (13) 27.0
 
May 8, 2021, 4 p.m. 5.0 ppb (5) 2.0 ppb (2) 6.4 ppb (7) 4.0 ppb (4) N/A 0.0 ppb (0) 28.0 ppb (26) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 26.0
 
May 8, 2021, 3 p.m. 7.0 ppb (7) 2.0 ppb (2) 7.8 ppb (8) 5.0 ppb (5) N/A 0.0 ppb (0) 26.0 ppb (25) 0.17 ppb (3) N/A 4.0 μg/m3 (17) 25.0
 
May 8, 2021, 2 p.m. 6.0 ppb (6) 1.0 ppb (1) 6.2 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 27.0 ppb (25) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 25.0
 
May 8, 2021, 1 p.m. 5.0 ppb (5) 1.0 ppb (1) 5.8 ppb (6) 4.0 ppb (4) N/A 0.0 ppb (0) 27.0 ppb (25) 0.14 ppb (2) N/A 2.0 μg/m3 (9) 25.0
 
May 8, 2021, noon 8.0 ppb (8) 2.0 ppb (2) 7.9 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 26.0 ppb (25) 0.16 ppb (3) N/A 4.0 μg/m3 (17) 25.0
 
May 8, 2021, 11 a.m. 8.0 ppb (8) 1.0 ppb (1) 8.4 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 26.0 ppb (25) 0.15 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
May 8, 2021, 10 a.m. 10.0 ppb (10) 1.0 ppb (1) 11.2 ppb (11) 9.0 ppb (9) N/A 0.0 ppb (0) 22.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0
 
May 8, 2021, 9 a.m. 9.0 ppb (9) 0.0 ppb (0) 9.8 ppb (10) 8.0 ppb (8) N/A 0.0 ppb (0) 22.0 ppb (21) 0.16 ppb (3) N/A 1.0 μg/m3 (5) 21.0
 
May 8, 2021, 8 a.m. 7.0 ppb (7) 0.0 ppb (0) 7.6 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) N/A 0.15 ppb (2) N/A -1.0 μg/m3 (0) 8.0
 
May 8, 2021, 7 a.m. N/A N/A 10.4 ppb (10) N/A N/A 0.0 ppb (0) 20.0 ppb (19) 0.17 ppb (3) N/A 2.0 μg/m3 (9) 19.0
 
May 8, 2021, 6 a.m. N/A N/A 11.0 ppb (11) N/A N/A 0.0 ppb (0) 21.0 ppb (20) 0.3 ppb (4) N/A 4.0 μg/m3 (17) 20.0
 
May 8, 2021, 5 a.m. N/A N/A 15.3 ppb (15) N/A N/A 0.0 ppb (0) 18.0 ppb (17) 0.21 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
May 8, 2021, 4 a.m. 26.0 ppb (25) 4.0 ppb (4) 26.9 ppb (26) 22.0 ppb (21) N/A N/A 10.0 ppb (10) 0.32 ppb (4) N/A 5.0 μg/m3 (21) 26.0
 
May 8, 2021, 3 a.m. 14.0 ppb (14) 1.0 ppb (1) 14.4 ppb (14) 12.0 ppb (12) N/A N/A 17.0 ppb (16) 0.23 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
May 8, 2021, 2 a.m. 13.0 ppb (13) 1.0 ppb (1) 13.9 ppb (14) 12.0 ppb (12) N/A N/A 20.0 ppb (19) 0.19 ppb (3) N/A 3.0 μg/m3 (13) 19.0
 
May 8, 2021, 1 a.m. 11.0 ppb (11) 1.0 ppb (1) 11.9 ppb (12) 10.0 ppb (10) N/A 0.0 ppb (0) 23.0 ppb (22) 0.19 ppb (3) N/A 2.0 μg/m3 (9) 22.0
 
May 8, 2021, midnight 8.0 ppb (8) 0.0 ppb (0) N/A 7.0 ppb (7) N/A 0.0 ppb (0) 26.0 ppb (25) 0.17 ppb (3) N/A 3.0 μg/m3 (13) 25.0
 
May 7, 2021, 11 p.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (27) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 27.0
 
May 7, 2021, 10 p.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (27) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 27.0
 
May 7, 2021, 9 p.m. 8.0 ppb (8) 2.0 ppb (2) 8.4 ppb (8) 6.0 ppb (6) N/A 0.0 ppb (0) 30.0 ppb (28) 0.16 ppb (3) N/A 3.0 μg/m3 (13) 28.0
 
May 7, 2021, 8 p.m. 7.0 ppb (7) 2.0 ppb (2) 7.3 ppb (7) 5.0 ppb (5) N/A 0.0 ppb (0) 31.0 ppb (29) 0.16 ppb (3) N/A 1.0 μg/m3 (5) 29.0
 
May 7, 2021, 7 p.m. 6.0 ppb (6) 2.0 ppb (2) 6.7 ppb (7) 4.0 ppb (4) N/A 0.0 ppb (0) 31.0 ppb (29) 0.15 ppb (2) N/A 1.0 μg/m3 (5) 29.0
 
May 7, 2021, 6 p.m. 11.0 ppb (11) 5.0 ppb (5) 9.5 ppb (9) 6.0 ppb (6) N/A 0.0 ppb (0) 30.0 ppb (28) 0.16 ppb (3) N/A 5.0 μg/m3 (21) 28.0
 
May 7, 2021, 5 p.m. 12.0 ppb (12) 6.0 ppb (6) 13.1 ppb (13) 6.0 ppb (6) N/A 0.0 ppb (0) 29.0 ppb (27) 0.15 ppb (2) N/A 5.0 μg/m3 (21) 27.0
 
May 7, 2021, 4 p.m. 15.0 ppb (15) 8.0 ppb (8) 13.5 ppb (13) 7.0 ppb (7) N/A 0.0 ppb (0) 28.0 ppb (26) N/A N/A 5.0 μg/m3 (21) 26.0
 
May 7, 2021, 3 p.m. 17.0 ppb (17) 8.0 ppb (8) 16.4 ppb (16) 8.0 ppb (8) N/A 0.0 ppb (0) 26.0 ppb (25) N/A N/A 6.0 μg/m3 (25) 25.0
 
May 7, 2021, 2 p.m. 21.0 ppb (20) 10.0 ppb (10) 21.2 ppb (20) 11.0 ppb (11) N/A 0.0 ppb (0) 26.0 ppb (25) 0.14 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
May 7, 2021, 1 p.m. 16.0 ppb (16) 6.0 ppb (6) 15.8 ppb (15) 9.0 ppb (9) N/A 0.0 ppb (0) 29.0 ppb (27) 0.15 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
May 7, 2021, noon 22.0 ppb (21) 9.0 ppb (9) 20.5 ppb (20) 13.0 ppb (13) N/A 0.0 ppb (0) 27.0 ppb (25) 0.18 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
May 7, 2021, 11 a.m. 41.0 ppb (39) 20.0 ppb (19) 38.1 ppb (36) 22.0 ppb (21) N/A 1.0 ppb (2) 19.0 ppb (18) 0.21 ppb (3) N/A 4.0 μg/m3 (17) 39.0
 
May 7, 2021, 10 a.m. 33.0 ppb (32) 9.0 ppb (9) 33.8 ppb (32) 25.0 ppb (24) N/A 0.0 ppb (0) 13.0 ppb (13) 0.32 ppb (4) N/A 4.0 μg/m3 (17) 32.0
 
May 7, 2021, 9 a.m. 18.0 ppb (17) 1.0 ppb (1) 19.0 ppb (18) 17.0 ppb (17) N/A 0.0 ppb (0) 20.0 ppb (19) 0.18 ppb (3) N/A 3.0 μg/m3 (13) 19.0
 
May 7, 2021, 8 a.m. 12.0 ppb (12) 0.0 ppb (0) 13.1 ppb (13) 12.0 ppb (12) N/A 0.0 ppb (0) 24.0 ppb (23) 0.15 ppb (2) N/A 3.0 μg/m3 (13) 23.0
 
May 7, 2021, 7 a.m. 15.0 ppb (15) 1.0 ppb (1) 16.3 ppb (16) 14.0 ppb (14) N/A 0.0 ppb (0) 21.0 ppb (20) 0.3 ppb (4) N/A 3.0 μg/m3 (13) 20.0
 
May 7, 2021, 6 a.m. 8.0 ppb (8) 1.0 ppb (1) 8.3 ppb (8) 7.0 ppb (7) N/A 0.0 ppb (0) 30.0 ppb (28) 0.14 ppb (2) N/A 4.0 μg/m3 (17) 28.0